Merge pull request #1380 from ThibG/glitch-soc/merge-upstream

Merge upstream changes

35 files changed, 648 insertions, 594 deletions

diff --git a/app/javascript/flavours/glitch/actions/dropdown_menu.js b/app/javascript/flavours/glitch/actions/dropdown_menu.js
index 14f2939c7..fb6e55612 100644
--- a/app/javascript/flavours/glitch/actions/dropdown_menu.js
+++ b/app/javascript/flavours/glitch/actions/dropdown_menu.js
@@ -1,8 +1,8 @@
 export const DROPDOWN_MENU_OPEN = 'DROPDOWN_MENU_OPEN';
 export const DROPDOWN_MENU_CLOSE = 'DROPDOWN_MENU_CLOSE';
 
-export function openDropdownMenu(id, placement, keyboard) {
-  return { type: DROPDOWN_MENU_OPEN, id, placement, keyboard };
+export function openDropdownMenu(id, placement, keyboard, scroll_key) {
+  return { type: DROPDOWN_MENU_OPEN, id, placement, keyboard, scroll_key };
 }
 
 export function closeDropdownMenu(id) {
diff --git a/app/javascript/flavours/glitch/components/blurhash.js b/app/javascript/flavours/glitch/components/blurhash.js
new file mode 100644
index 000000000..2af5cfc56
--- /dev/null
+++ b/app/javascript/flavours/glitch/components/blurhash.js
@@ -0,0 +1,65 @@
+// @ts-check
+
+import { decode } from 'blurhash';
+import React, { useRef, useEffect } from 'react';
+import PropTypes from 'prop-types';
+
+/**
+ * @typedef BlurhashPropsBase
+ * @property {string?} hash Hash to render
+ * @property {number} width
+ * Width of the blurred region in pixels. Defaults to 32
+ * @property {number} [height]
+ * Height of the blurred region in pixels. Defaults to width
+ * @property {boolean} [dummy]
+ * Whether dummy mode is enabled. If enabled, nothing is rendered
+ * and canvas left untouched
+ */
+
+/** @typedef {JSX.IntrinsicElements['canvas'] & BlurhashPropsBase} BlurhashProps */
+
+/**
+ * Component that is used to render blurred of blurhash string
+ *
+ * @param {BlurhashProps} param1 Props of the component
+ * @returns Canvas which will render blurred region element to embed
+ */
+function Blurhash({
+  hash,
+  width = 32,
+  height = width,
+  dummy = false,
+  ...canvasProps
+}) {
+  const canvasRef = /** @type {import('react').MutableRefObject<HTMLCanvasElement>} */ (useRef());
+
+  useEffect(() => {
+    const { current: canvas } = canvasRef;
+    canvas.width = canvas.width; // resets canvas
+
+    if (dummy || !hash) return;
+
+    try {
+      const pixels = decode(hash, width, height);
+      const ctx = canvas.getContext('2d');
+      const imageData = new ImageData(pixels, width, height);
+
+      ctx.putImageData(imageData, 0, 0);
+    } catch (err) {
+      console.error('Blurhash decoding failure', { err, hash });
+    }
+  }, [dummy, hash, width, height]);
+
+  return (
+    <canvas {...canvasProps} ref={canvasRef} width={width} height={height} />
+  );
+}
+
+Blurhash.propTypes = {
+  hash: PropTypes.string.isRequired,
+  width: PropTypes.number,
+  height: PropTypes.number,
+  dummy: PropTypes.bool,
+};
+
+export default React.memo(Blurhash);
diff --git a/app/javascript/flavours/glitch/components/media_gallery.js b/app/javascript/flavours/glitch/components/media_gallery.js
index 71240530c..3a4839414 100644
--- a/app/javascript/flavours/glitch/components/media_gallery.js
+++ b/app/javascript/flavours/glitch/components/media_gallery.js
@@ -7,8 +7,8 @@ import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import { isIOS } from 'flavours/glitch/util/is_mobile';
 import classNames from 'classnames';
 import { autoPlayGif, displayMedia, useBlurhash } from 'flavours/glitch/util/initial_state';
-import { decode } from 'blurhash';
 import { debounce } from 'lodash';
+import Blurhash from 'flavours/glitch/components/blurhash';
 
 const messages = defineMessages({
   hidden: {
@@ -94,36 +94,6 @@ class Item extends React.PureComponent {
     e.stopPropagation();
   }
 
-  componentDidMount () {
-    if (this.props.attachment.get('blurhash')) {
-      this._decode();
-    }
-  }
-
-  componentDidUpdate (prevProps) {
-    if (prevProps.attachment.get('blurhash') !== this.props.attachment.get('blurhash') && this.props.attachment.get('blurhash')) {
-      this._decode();
-    }
-  }
-
-  _decode () {
-    if (!useBlurhash) return;
-
-    const hash   = this.props.attachment.get('blurhash');
-    const pixels = decode(hash, 32, 32);
-
-    if (pixels) {
-      const ctx       = this.canvas.getContext('2d');
-      const imageData = new ImageData(pixels, 32, 32);
-
-      ctx.putImageData(imageData, 0, 0);
-    }
-  }
-
-  setCanvasRef = c => {
-    this.canvas = c;
-  }
-
   handleImageLoad = () => {
     this.setState({ loaded: true });
   }
@@ -186,7 +156,11 @@ class Item extends React.PureComponent {
       return (
         <div className={classNames('media-gallery__item', { standalone })} key={attachment.get('id')} style={{ left: left, top: top, right: right, bottom: bottom, width: `${width}%`, height: `${height}%` }}>
           <a className='media-gallery__item-thumbnail' href={attachment.get('remote_url') || attachment.get('url')} style={{ cursor: 'pointer' }} title={attachment.get('description')} target='_blank' rel='noopener noreferrer'>
-            <canvas width={32} height={32} ref={this.setCanvasRef} className='media-gallery__preview' />
+            <Blurhash
+              hash={attachment.get('blurhash')}
+              className='media-gallery__preview'
+              dummy={!useBlurhash}
+            />
           </a>
         </div>
       );
@@ -253,7 +227,13 @@ class Item extends React.PureComponent {
 
     return (
       <div className={classNames('media-gallery__item', { standalone, letterbox })} key={attachment.get('id')} style={{ left: left, top: top, right: right, bottom: bottom, width: `${width}%`, height: `${height}%` }}>
-        <canvas width={32} height={32} ref={this.setCanvasRef} className={classNames('media-gallery__preview', { 'media-gallery__preview--hidden': visible && this.state.loaded })} />
+        <Blurhash
+          hash={attachment.get('blurhash')}
+          dummy={!useBlurhash}
+          className={classNames('media-gallery__preview', {
+            'media-gallery__preview--hidden': visible && this.state.loaded,
+          })}
+        />
         {visible && thumbnail}
       </div>
     );
diff --git a/app/javascript/flavours/glitch/components/scrollable_list.js b/app/javascript/flavours/glitch/components/scrollable_list.js
index fae0a7393..5d10ed650 100644
--- a/app/javascript/flavours/glitch/components/scrollable_list.js
+++ b/app/javascript/flavours/glitch/components/scrollable_list.js
@@ -10,10 +10,18 @@ import { List as ImmutableList } from 'immutable';
 import classNames from 'classnames';
 import { attachFullscreenListener, detachFullscreenListener, isFullscreen } from 'flavours/glitch/util/fullscreen';
 import LoadingIndicator from './loading_indicator';
+import { connect } from 'react-redux';
 
 const MOUSE_IDLE_DELAY = 300;
 
-export default class ScrollableList extends PureComponent {
+const mapStateToProps = (state, { scrollKey }) => {
+  return {
+    preventScroll: scrollKey === state.getIn(['dropdown_menu', 'scroll_key']),
+  };
+};
+
+export default @connect(mapStateToProps)
+class ScrollableList extends PureComponent {
 
   static contextTypes = {
     router: PropTypes.object,
@@ -37,6 +45,7 @@ export default class ScrollableList extends PureComponent {
     emptyMessage: PropTypes.node,
     children: PropTypes.node,
     bindToDocument: PropTypes.bool,
+    preventScroll: PropTypes.bool,
   };
 
   static defaultProps = {
@@ -124,7 +133,7 @@ export default class ScrollableList extends PureComponent {
   });
 
   handleMouseIdle = () => {
-    if (this.scrollToTopOnMouseIdle) {
+    if (this.scrollToTopOnMouseIdle && !this.props.preventScroll) {
       this.setScrollTop(0);
     }
     this.mouseMovedRecently = false;
@@ -176,7 +185,7 @@ export default class ScrollableList extends PureComponent {
       this.getFirstChildKey(prevProps) !== this.getFirstChildKey(this.props);
     const pendingChanged = (prevProps.numPending > 0) !== (this.props.numPending > 0);
 
-    if (pendingChanged || someItemInserted && (this.getScrollTop() > 0 || this.mouseMovedRecently)) {
+    if (pendingChanged || someItemInserted && (this.getScrollTop() > 0 || this.mouseMovedRecently || this.props.preventScroll)) {
       return this.getScrollHeight() - this.getScrollTop();
     } else {
       return null;
diff --git a/app/javascript/flavours/glitch/components/status.js b/app/javascript/flavours/glitch/components/status.js
index ba0823a60..4e628a420 100644
--- a/app/javascript/flavours/glitch/components/status.js
+++ b/app/javascript/flavours/glitch/components/status.js
@@ -96,6 +96,7 @@ class Status extends ImmutablePureComponent {
     cacheMediaWidth: PropTypes.func,
     cachedMediaWidth: PropTypes.number,
     onClick: PropTypes.func,
+    scrollKey: PropTypes.string,
   };
 
   state = {
diff --git a/app/javascript/flavours/glitch/components/status_action_bar.js b/app/javascript/flavours/glitch/components/status_action_bar.js
index 0a481c816..c314c5fd5 100644
--- a/app/javascript/flavours/glitch/components/status_action_bar.js
+++ b/app/javascript/flavours/glitch/components/status_action_bar.js
@@ -74,6 +74,7 @@ class StatusActionBar extends ImmutablePureComponent {
     withDismiss: PropTypes.bool,
     showReplyCount: PropTypes.bool,
     directMessage: PropTypes.bool,
+    scrollKey: PropTypes.string,
     intl: PropTypes.object.isRequired,
   };
 
@@ -198,7 +199,7 @@ class StatusActionBar extends ImmutablePureComponent {
   }
 
   render () {
-    const { status, intl, withDismiss, showReplyCount, directMessage } = this.props;
+    const { status, intl, withDismiss, showReplyCount, directMessage, scrollKey } = this.props;
 
     const mutingConversation = status.get('muted');
     const anonymousAccess    = !me;
@@ -300,7 +301,16 @@ class StatusActionBar extends ImmutablePureComponent {
           <IconButton key='bookmark-button' className='status__action-bar-button bookmark-icon' disabled={anonymousAccess} active={status.get('bookmarked')} pressed={status.get('bookmarked')} title={intl.formatMessage(messages.bookmark)} icon='bookmark' onClick={this.handleBookmarkClick} />,
           filterButton,
           <div key='dropdown-button' className='status__action-bar-dropdown'>
-            <DropdownMenuContainer disabled={anonymousAccess} status={status} items={menu} icon='ellipsis-h' size={18} direction='right' ariaLabel={intl.formatMessage(messages.more)} />
+            <DropdownMenuContainer
+              scrollKey={scrollKey}
+              disabled={anonymousAccess}
+              status={status}
+              items={menu}
+              icon='ellipsis-h'
+              size={18}
+              direction='right'
+              ariaLabel={intl.formatMessage(messages.more)}
+            />
           </div>,
         ]}
 
diff --git a/app/javascript/flavours/glitch/components/status_list.js b/app/javascript/flavours/glitch/components/status_list.js
index a399ff567..60cc23f4b 100644
--- a/app/javascript/flavours/glitch/components/status_list.js
+++ b/app/javascript/flavours/glitch/components/status_list.js
@@ -99,6 +99,7 @@ export default class StatusList extends ImmutablePureComponent {
           onMoveUp={this.handleMoveUp}
           onMoveDown={this.handleMoveDown}
           contextType={timelineId}
+          scrollKey={this.props.scrollKey}
         />
       ))
     ) : null;
@@ -112,6 +113,7 @@ export default class StatusList extends ImmutablePureComponent {
           onMoveUp={this.handleMoveUp}
           onMoveDown={this.handleMoveDown}
           contextType={timelineId}
+          scrollKey={this.props.scrollKey}
         />
       )).concat(scrollableContent);
     }
diff --git a/app/javascript/flavours/glitch/containers/dropdown_menu_container.js b/app/javascript/flavours/glitch/containers/dropdown_menu_container.js
index 1378e75fe..e60ee814d 100644
--- a/app/javascript/flavours/glitch/containers/dropdown_menu_container.js
+++ b/app/javascript/flavours/glitch/containers/dropdown_menu_container.js
@@ -11,7 +11,7 @@ const mapStateToProps = state => ({
   openedViaKeyboard: state.getIn(['dropdown_menu', 'keyboard']),
 });
 
-const mapDispatchToProps = (dispatch, { status, items }) => ({
+const mapDispatchToProps = (dispatch, { status, items, scrollKey }) => ({
   onOpen(id, onItemClick, dropdownPlacement, keyboard) {
     dispatch(isUserTouching() ? openModal('ACTIONS', {
       status,
@@ -22,7 +22,7 @@ const mapDispatchToProps = (dispatch, { status, items }) => ({
           onClick: item.action ? ((e) => { return onItemClick(i, e) }) : null,
         } : null
       ),
-    }) : openDropdownMenu(id, dropdownPlacement, keyboard));
+    }) : openDropdownMenu(id, dropdownPlacement, keyboard, scrollKey));
   },
   onClose(id) {
     dispatch(closeModal('ACTIONS'));
diff --git a/app/javascript/flavours/glitch/features/account_gallery/components/media_item.js b/app/javascript/flavours/glitch/features/account_gallery/components/media_item.js
index f1cb3f9e4..b88f23aa4 100644
--- a/app/javascript/flavours/glitch/features/account_gallery/components/media_item.js
+++ b/app/javascript/flavours/glitch/features/account_gallery/components/media_item.js
@@ -1,7 +1,7 @@
-import { decode } from 'blurhash';
+import Blurhash from 'flavours/glitch/components/blurhash';
 import classNames from 'classnames';
 import Icon from 'flavours/glitch/components/icon';
-import { autoPlayGif, displayMedia } from 'flavours/glitch/util/initial_state';
+import { autoPlayGif, displayMedia, useBlurhash } from 'flavours/glitch/util/initial_state';
 import { isIOS } from 'flavours/glitch/util/is_mobile';
 import PropTypes from 'prop-types';
 import React from 'react';
@@ -21,34 +21,6 @@ export default class MediaItem extends ImmutablePureComponent {
     loaded: false,
   };
 
-  componentDidMount () {
-    if (this.props.attachment.get('blurhash')) {
-      this._decode();
-    }
-  }
-
-  componentDidUpdate (prevProps) {
-    if (prevProps.attachment.get('blurhash') !== this.props.attachment.get('blurhash') && this.props.attachment.get('blurhash')) {
-      this._decode();
-    }
-  }
-
-  _decode () {
-    const hash   = this.props.attachment.get('blurhash');
-    const pixels = decode(hash, 32, 32);
-
-    if (pixels) {
-      const ctx       = this.canvas.getContext('2d');
-      const imageData = new ImageData(pixels, 32, 32);
-
-      ctx.putImageData(imageData, 0, 0);
-    }
-  }
-
-  setCanvasRef = c => {
-    this.canvas = c;
-  }
-
   handleImageLoad = () => {
     this.setState({ loaded: true });
   }
@@ -149,7 +121,13 @@ export default class MediaItem extends ImmutablePureComponent {
     return (
       <div className='account-gallery__item' style={{ width, height }}>
         <a className='media-gallery__item-thumbnail' href={status.get('url')} onClick={this.handleClick} title={title} target='_blank' rel='noopener noreferrer'>
-          <canvas width={32} height={32} ref={this.setCanvasRef} className={classNames('media-gallery__preview', { 'media-gallery__preview--hidden': visible && loaded })} />
+          <Blurhash
+            hash={attachment.get('blurhash')}
+            className={classNames('media-gallery__preview', {
+              'media-gallery__preview--hidden': visible && loaded,
+            })}
+            dummy={!useBlurhash}
+          />
           {visible ? thumbnail : icon}
         </a>
       </div>
diff --git a/app/javascript/flavours/glitch/features/audio/index.js b/app/javascript/flavours/glitch/features/audio/index.js
index d833e0fe9..120a5ce1a 100644
--- a/app/javascript/flavours/glitch/features/audio/index.js
+++ b/app/javascript/flavours/glitch/features/audio/index.js
@@ -7,11 +7,7 @@ import classNames from 'classnames';
 import { throttle } from 'lodash';
 import { getPointerPosition, fileNameFromURL } from 'flavours/glitch/features/video';
 import { debounce } from 'lodash';
-
-const hex2rgba = (hex, alpha = 1) => {
-  const [r, g, b] = hex.match(/\w\w/g).map(x => parseInt(x, 16));
-  return `rgba(${r}, ${g}, ${b}, ${alpha})`;
-};
+import Visualizer from './visualizer';
 
 const messages = defineMessages({
   play: { id: 'video.play', defaultMessage: 'Play' },
@@ -54,6 +50,11 @@ class Audio extends React.PureComponent {
     dragging: false,
   };
 
+  constructor (props) {
+    super(props);
+    this.visualizer = new Visualizer(TICK_SIZE);
+  }
+
   setPlayerRef = c => {
     this.player = c;
 
@@ -92,9 +93,7 @@ class Audio extends React.PureComponent {
   setCanvasRef = c => {
     this.canvas = c;
 
-    if (c) {
-      this.canvasContext = c.getContext('2d');
-    }
+    this.visualizer.setCanvas(c);
   }
  
   componentDidMount () {
@@ -247,17 +246,12 @@ class Audio extends React.PureComponent {
 
   _initAudioContext () {
     const context  = new AudioContext();
-    const analyser = context.createAnalyser();
     const source   = context.createMediaElementSource(this.audio);
 
-    analyser.smoothingTimeConstant = 0.6;
-    analyser.fftSize = 2048;
-
-    source.connect(analyser);
+    this.visualizer.setAudioContext(context, source);
     source.connect(context.destination);
 
     this.audioContext = context;
-    this.analyser = analyser;
   }
 
   handleDownload = () => {
@@ -290,20 +284,12 @@ class Audio extends React.PureComponent {
     });
   }
 
-  _clear () {
-    this.canvasContext.clearRect(0, 0, this.state.width, this.state.height);
+  _clear() {
+    this.visualizer.clear(this.state.width, this.state.height);
   }
 
-  _draw () {
-    this.canvasContext.save();
-
-    const ticks = this._getTicks(360 * this._getScaleCoefficient(), TICK_SIZE);
-
-    ticks.forEach(tick => {
-      this._drawTick(tick.x1, tick.y1, tick.x2, tick.y2);
-    });
-
-    this.canvasContext.restore();
+  _draw() {
+    this.visualizer.draw(this._getCX(), this._getCY(), this._getAccentColor(), this._getRadius(), this._getScaleCoefficient());
   }
 
   _getRadius () {
@@ -314,126 +300,6 @@ class Audio extends React.PureComponent {
     return (this.state.height || this.props.height) / 982;
   }
 
-  _getTicks (count, size, animationParams = [0, 90]) {
-    const radius = this._getRadius();
-    const ticks = this._getTickPoints(count);
-    const lesser = 200;
-    const m = [];
-    const bufferLength = this.analyser ? this.analyser.frequencyBinCount : 0;
-    const frequencyData = new Uint8Array(bufferLength);
-    const allScales = [];
-    const scaleCoefficient = this._getScaleCoefficient();
-
-    if (this.analyser) {
-      this.analyser.getByteFrequencyData(frequencyData);
-    }
-
-    ticks.forEach((tick, i) => {
-      const coef = 1 - i / (ticks.length * 2.5);
-
-      let delta = ((frequencyData[i] || 0) - lesser * coef) * scaleCoefficient;
-
-      if (delta < 0) {
-        delta = 0;
-      }
-
-      let k;
-
-      if (animationParams[0] <= tick.angle && tick.angle <= animationParams[1]) {
-        k = radius / (radius - this._getSize(tick.angle, animationParams[0], animationParams[1]) - delta);
-      } else {
-        k = radius / (radius - (size + delta));
-      }
-
-      const x1 = tick.x * (radius - size);
-      const y1 = tick.y * (radius - size);
-      const x2 = x1 * k;
-      const y2 = y1 * k;
-
-      m.push({ x1, y1, x2, y2 });
-
-      if (i < 20) {
-        let scale = delta / (200 * scaleCoefficient);
-        scale = scale < 1 ? 1 : scale;
-        allScales.push(scale);
-      }
-    });
-
-    const scale = allScales.reduce((pv, cv) => pv + cv, 0) / allScales.length;
-
-    return m.map(({ x1, y1, x2, y2 }) => ({
-      x1: x1,
-      y1: y1,
-      x2: x2 * scale,
-      y2: y2 * scale,
-    }));
-  }
-
-  _getSize (angle, l, r) {
-    const scaleCoefficient = this._getScaleCoefficient();
-    const maxTickSize = TICK_SIZE * 9 * scaleCoefficient;
-    const m = (r - l) / 2;
-    const x = (angle - l);
-
-    let h;
-
-    if (x === m) {
-      return maxTickSize;
-    }
-
-    const d = Math.abs(m - x);
-    const v = 40 * Math.sqrt(1 / d);
-
-    if (v > maxTickSize) {
-      h = maxTickSize;
-    } else {
-      h = Math.max(TICK_SIZE, v);
-    }
-
-    return h;
-  }
-
-  _getTickPoints (count) {
-    const PI = 360;
-    const coords = [];
-    const step = PI / count;
-
-    let rad;
-
-    for(let deg = 0; deg < PI; deg += step) {
-      rad = deg * Math.PI / (PI / 2);
-      coords.push({ x: Math.cos(rad), y: -Math.sin(rad), angle: deg });
-    }
-
-    return coords;
-  }
-
-  _drawTick (x1, y1, x2, y2) {
-    const cx = this._getCX();
-    const cy = this._getCY();
-
-    const dx1 = Math.ceil(cx + x1);
-    const dy1 = Math.ceil(cy + y1);
-    const dx2 = Math.ceil(cx + x2);
-    const dy2 = Math.ceil(cy + y2);
-
-    const gradient = this.canvasContext.createLinearGradient(dx1, dy1, dx2, dy2);
-
-    const mainColor = this._getAccentColor();
-    const lastColor = hex2rgba(mainColor, 0);
-
-    gradient.addColorStop(0, mainColor);
-    gradient.addColorStop(0.6, mainColor);
-    gradient.addColorStop(1, lastColor);
-
-    this.canvasContext.beginPath();
-    this.canvasContext.strokeStyle = gradient;
-    this.canvasContext.lineWidth = 2;
-    this.canvasContext.moveTo(dx1, dy1);
-    this.canvasContext.lineTo(dx2, dy2);
-    this.canvasContext.stroke();
-  }
-
   _getCX() {
     return Math.floor(this.state.width / 2);
   }
diff --git a/app/javascript/flavours/glitch/features/audio/visualizer.js b/app/javascript/flavours/glitch/features/audio/visualizer.js
new file mode 100644
index 000000000..77d5b5a65
--- /dev/null
+++ b/app/javascript/flavours/glitch/features/audio/visualizer.js
@@ -0,0 +1,136 @@
+/*
+Copyright (c) 2020 by Alex Permyakov (https://codepen.io/alexdevp/pen/RNELPV)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+const hex2rgba = (hex, alpha = 1) => {
+  const [r, g, b] = hex.match(/\w\w/g).map(x => parseInt(x, 16));
+  return `rgba(${r}, ${g}, ${b}, ${alpha})`;
+};
+
+export default class Visualizer {
+
+  constructor (tickSize) {
+    this.tickSize = tickSize;
+  }
+
+  setCanvas(canvas) {
+    this.canvas = canvas;
+    if (canvas) {
+      this.context = canvas.getContext('2d');
+    }
+  }
+
+  setAudioContext(context, source) {
+    const analyser = context.createAnalyser();
+
+    analyser.smoothingTimeConstant = 0.6;
+    analyser.fftSize = 2048;
+
+    source.connect(analyser);
+
+    this.analyser = analyser;
+  }
+
+  getTickPoints (count) {
+    const coords = [];
+
+    for(let i = 0; i < count; i++) {
+      const rad = Math.PI * 2 * i / count;
+      coords.push({ x: Math.cos(rad), y: -Math.sin(rad) });
+    }
+
+    return coords;
+  }
+
+  drawTick (cx, cy, mainColor, x1, y1, x2, y2) {
+    const dx1 = Math.ceil(cx + x1);
+    const dy1 = Math.ceil(cy + y1);
+    const dx2 = Math.ceil(cx + x2);
+    const dy2 = Math.ceil(cy + y2);
+
+    const gradient = this.context.createLinearGradient(dx1, dy1, dx2, dy2);
+
+    const lastColor = hex2rgba(mainColor, 0);
+
+    gradient.addColorStop(0, mainColor);
+    gradient.addColorStop(0.6, mainColor);
+    gradient.addColorStop(1, lastColor);
+
+    this.context.beginPath();
+    this.context.strokeStyle = gradient;
+    this.context.lineWidth = 2;
+    this.context.moveTo(dx1, dy1);
+    this.context.lineTo(dx2, dy2);
+    this.context.stroke();
+  }
+
+  getTicks (count, size, radius, scaleCoefficient) {
+    const ticks = this.getTickPoints(count);
+    const lesser = 200;
+    const m = [];
+    const bufferLength = this.analyser ? this.analyser.frequencyBinCount : 0;
+    const frequencyData = new Uint8Array(bufferLength);
+    const allScales = [];
+
+    if (this.analyser) {
+      this.analyser.getByteFrequencyData(frequencyData);
+    }
+
+    ticks.forEach((tick, i) => {
+      const coef = 1 - i / (ticks.length * 2.5);
+
+      let delta = ((frequencyData[i] || 0) - lesser * coef) * scaleCoefficient;
+
+      if (delta < 0) {
+        delta = 0;
+      }
+
+      const k = radius / (radius - (size + delta));
+
+      const x1 = tick.x * (radius - size);
+      const y1 = tick.y * (radius - size);
+      const x2 = x1 * k;
+      const y2 = y1 * k;
+
+      m.push({ x1, y1, x2, y2 });
+
+      if (i < 20) {
+        let scale = delta / (200 * scaleCoefficient);
+        scale = scale < 1 ? 1 : scale;
+        allScales.push(scale);
+      }
+    });
+
+    const scale = allScales.reduce((pv, cv) => pv + cv, 0) / allScales.length;
+
+    return m.map(({ x1, y1, x2, y2 }) => ({
+      x1: x1,
+      y1: y1,
+      x2: x2 * scale,
+      y2: y2 * scale,
+    }));
+  }
+
+  clear (width, height) {
+    this.context.clearRect(0, 0, width, height);
+  }
+
+  draw (cx, cy, color, radius, coefficient) {
+    this.context.save();
+
+    const ticks = this.getTicks(parseInt(360 * coefficient), this.tickSize, radius, coefficient);
+
+    ticks.forEach(tick => {
+      this.drawTick(cx, cy, color, tick.x1, tick.y1, tick.x2, tick.y2);
+    });
+
+    this.context.restore();
+  }
+
+}
diff --git a/app/javascript/flavours/glitch/features/direct_timeline/components/conversation.js b/app/javascript/flavours/glitch/features/direct_timeline/components/conversation.js
index 47b92560d..0af8b348f 100644
--- a/app/javascript/flavours/glitch/features/direct_timeline/components/conversation.js
+++ b/app/javascript/flavours/glitch/features/direct_timeline/components/conversation.js
@@ -36,6 +36,7 @@ class Conversation extends ImmutablePureComponent {
     accounts: ImmutablePropTypes.list.isRequired,
     lastStatus: ImmutablePropTypes.map,
     unread:PropTypes.bool.isRequired,
+    scrollKey: PropTypes.string,
     onMoveUp: PropTypes.func,
     onMoveDown: PropTypes.func,
     markRead: PropTypes.func.isRequired,
@@ -156,7 +157,7 @@ class Conversation extends ImmutablePureComponent {
   }
 
   render () {
-    const { accounts, lastStatus, unread, intl } = this.props;
+    const { accounts, lastStatus, unread, scrollKey, intl } = this.props;
     const { isExpanded } = this.state;
 
     if (lastStatus === null) {
@@ -223,7 +224,15 @@ class Conversation extends ImmutablePureComponent {
               <IconButton className='status__action-bar-button' title={intl.formatMessage(messages.reply)} icon='reply' onClick={this.handleReply} />
 
               <div className='status__action-bar-dropdown'>
-                <DropdownMenuContainer status={lastStatus} items={menu} icon='ellipsis-h' size={18} direction='right' title={intl.formatMessage(messages.more)} />
+                <DropdownMenuContainer
+                  scrollKey={scrollKey}
+                  status={lastStatus}
+                  items={menu}
+                  icon='ellipsis-h'
+                  size={18}
+                  direction='right'
+                  title={intl.formatMessage(messages.more)}
+                />
               </div>
             </div>
           </div>
diff --git a/app/javascript/flavours/glitch/features/direct_timeline/components/conversations_list.js b/app/javascript/flavours/glitch/features/direct_timeline/components/conversations_list.js
index 4fa76fd6d..c2aff1b57 100644
--- a/app/javascript/flavours/glitch/features/direct_timeline/components/conversations_list.js
+++ b/app/javascript/flavours/glitch/features/direct_timeline/components/conversations_list.js
@@ -10,6 +10,7 @@ export default class ConversationsList extends ImmutablePureComponent {
 
   static propTypes = {
     conversations: ImmutablePropTypes.list.isRequired,
+    scrollKey: PropTypes.string.isRequired,
     hasMore: PropTypes.bool,
     isLoading: PropTypes.bool,
     onLoadMore: PropTypes.func,
@@ -57,13 +58,14 @@ export default class ConversationsList extends ImmutablePureComponent {
     const { conversations, onLoadMore, ...other } = this.props;
 
     return (
-      <ScrollableList {...other} onLoadMore={onLoadMore && this.handleLoadOlder} scrollKey='direct' ref={this.setRef}>
+      <ScrollableList {...other} onLoadMore={onLoadMore && this.handleLoadOlder} ref={this.setRef}>
         {conversations.map(item => (
           <ConversationContainer
             key={item.get('id')}
             conversationId={item.get('id')}
             onMoveUp={this.handleMoveUp}
             onMoveDown={this.handleMoveDown}
+            scrollKey={this.props.scrollKey}
           />
         ))}
       </ScrollableList>
diff --git a/app/javascript/flavours/glitch/features/status/components/card.js b/app/javascript/flavours/glitch/features/status/components/card.js
index ab6398e1a..14abe9838 100644
--- a/app/javascript/flavours/glitch/features/status/components/card.js
+++ b/app/javascript/flavours/glitch/features/status/components/card.js
@@ -8,7 +8,7 @@ import classnames from 'classnames';
 import { decode as decodeIDNA } from 'flavours/glitch/util/idna';
 import Icon from 'flavours/glitch/components/icon';
 import { useBlurhash } from 'flavours/glitch/util/initial_state';
-import { decode } from 'blurhash';
+import Blurhash from 'flavours/glitch/components/blurhash';
 import { debounce } from 'lodash';
 
 const getHostname = url => {
@@ -85,38 +85,12 @@ export default class Card extends React.PureComponent {
 
   componentDidMount () {
     window.addEventListener('resize', this.handleResize, { passive: true });
-
-    if (this.props.card && this.props.card.get('blurhash') && this.canvas) {
-      this._decode();
-    }
   }
 
   componentWillUnmount () {
     window.removeEventListener('resize', this.handleResize);
   }
 
-  componentDidUpdate (prevProps) {
-    const { card } = this.props;
-
-    if (card.get('blurhash') && (!prevProps.card || prevProps.card.get('blurhash') !== card.get('blurhash')) && this.canvas) {
-      this._decode();
-    }
-  }
-
-  _decode () {
-    if (!useBlurhash) return;
-
-    const hash   = this.props.card.get('blurhash');
-    const pixels = decode(hash, 32, 32);
-
-    if (pixels) {
-      const ctx       = this.canvas.getContext('2d');
-      const imageData = new ImageData(pixels, 32, 32);
-
-      ctx.putImageData(imageData, 0, 0);
-    }
-  }
-
   _setDimensions () {
     const width = this.node.offsetWidth;
 
@@ -174,10 +148,6 @@ export default class Card extends React.PureComponent {
     }
   }
 
-  setCanvasRef = c => {
-    this.canvas = c;
-  }
-
   handleImageLoad = () => {
     this.setState({ previewLoaded: true });
   }
@@ -230,7 +200,15 @@ export default class Card extends React.PureComponent {
     );
 
     let embed     = '';
-    let canvas = <canvas width={32} height={32} ref={this.setCanvasRef} className={classnames('status-card__image-preview', { 'status-card__image-preview--hidden' : revealed && this.state.previewLoaded })} />;
+    let canvas = (
+      <Blurhash
+        className={classnames('status-card__image-preview', {
+          'status-card__image-preview--hidden': revealed && this.state.previewLoaded,
+        })}
+        hash={card.get('blurhash')}
+        dummy={!useBlurhash}
+      />
+    );
     let thumbnail = <img src={card.get('image')} alt='' style={{ width: horizontal ? width : null, height: horizontal ? height : null, visibility: revealed ? null : 'hidden' }} onLoad={this.handleImageLoad} className='status-card__image-image' />;
     let spoilerButton = (
       <button type='button' onClick={this.handleReveal} className='spoiler-button__overlay'>
diff --git a/app/javascript/flavours/glitch/features/video/index.js b/app/javascript/flavours/glitch/features/video/index.js
index c7cb5bc43..976cdefc0 100644
--- a/app/javascript/flavours/glitch/features/video/index.js
+++ b/app/javascript/flavours/glitch/features/video/index.js
@@ -7,7 +7,7 @@ import classNames from 'classnames';
 import { isFullscreen, requestFullscreen, exitFullscreen } from 'flavours/glitch/util/fullscreen';
 import { displayMedia, useBlurhash } from 'flavours/glitch/util/initial_state';
 import Icon from 'flavours/glitch/components/icon';
-import { decode } from 'blurhash';
+import Blurhash from 'flavours/glitch/components/blurhash';
 
 const messages = defineMessages({
   play: { id: 'video.play', defaultMessage: 'Play' },
@@ -179,14 +179,6 @@ class Video extends React.PureComponent {
     this.volume = c;
   }
 
-  setCanvasRef = c => {
-    this.canvas = c;
-
-    if (c && this.props.blurhash) {
-      this._decode();
-    }
-  }
-
   handleMouseDownRoot = e => {
     e.preventDefault();
     e.stopPropagation();
@@ -305,10 +297,6 @@ class Video extends React.PureComponent {
     document.addEventListener('MSFullscreenChange', this.handleFullscreenChange, true);
 
     window.addEventListener('resize', this.handleResize, { passive: true });
-
-    if (this.props.blurhash) {
-      this._decode();
-    }
   }
 
   componentWillUnmount () {
@@ -330,23 +318,6 @@ class Video extends React.PureComponent {
     if (this.video && this.state.revealed && this.props.preventPlayback && !prevProps.preventPlayback) {
       this.video.pause();
     }
-    if (prevProps.blurhash !== this.props.blurhash && this.props.blurhash) {
-      this._decode();
-    }
-  }
-
-  _decode () {
-    if (!this.canvas || !useBlurhash) return;
-
-    const hash   = this.props.blurhash;
-    const pixels = decode(hash, 32, 32);
-
-    if (pixels) {
-      const ctx       = this.canvas.getContext('2d');
-      const imageData = new ImageData(pixels, 32, 32);
-
-      ctx.putImageData(imageData, 0, 0);
-    }
   }
 
   handleResize = debounce(() => {
@@ -440,7 +411,7 @@ class Video extends React.PureComponent {
   }
 
   render () {
-    const { preview, src, inline, startTime, onOpenVideo, onCloseVideo, intl, alt, letterbox, fullwidth, detailed, sensitive, link, editable } = this.props;
+    const { preview, src, inline, startTime, onOpenVideo, onCloseVideo, intl, alt, letterbox, fullwidth, detailed, sensitive, link, editable, blurhash } = this.props;
     const { containerWidth, currentTime, duration, volume, buffer, dragging, paused, fullscreen, hovered, muted, revealed } = this.state;
     const progress = (currentTime / duration) * 100;
     const playerStyle = {};
@@ -485,7 +456,13 @@ class Video extends React.PureComponent {
         onMouseDown={this.handleMouseDownRoot}
         tabIndex={0}
       >
-        <canvas width={32} height={32} ref={this.setCanvasRef} className={classNames('media-gallery__preview', { 'media-gallery__preview--hidden': revealed })} />
+        <Blurhash
+          hash={blurhash}
+          className={classNames('media-gallery__preview', {
+            'media-gallery__preview--hidden': revealed,
+          })}
+          dummy={!useBlurhash}
+        />
 
         {(revealed || editable) && <video
           ref={this.setVideoRef}
diff --git a/app/javascript/flavours/glitch/reducers/dropdown_menu.js b/app/javascript/flavours/glitch/reducers/dropdown_menu.js
index 36fd4f132..a78a11acc 100644
--- a/app/javascript/flavours/glitch/reducers/dropdown_menu.js
+++ b/app/javascript/flavours/glitch/reducers/dropdown_menu.js
@@ -4,14 +4,14 @@ import {
   DROPDOWN_MENU_CLOSE,
 } from '../actions/dropdown_menu';
 
-const initialState = Immutable.Map({ openId: null, placement: null, keyboard: false });
+const initialState = Immutable.Map({ openId: null, placement: null, keyboard: false, scroll_key: null });
 
 export default function dropdownMenu(state = initialState, action) {
   switch (action.type) {
   case DROPDOWN_MENU_OPEN:
-    return state.merge({ openId: action.id, placement: action.placement, keyboard: action.keyboard });
+    return state.merge({ openId: action.id, placement: action.placement, keyboard: action.keyboard, scroll_key: action.scroll_key });
   case DROPDOWN_MENU_CLOSE:
-    return state.get('openId') === action.id ? state.set('openId', null) : state;
+    return state.get('openId') === action.id ? state.set('openId', null).set('scroll_key', null) : state;
   default:
     return state;
   }
diff --git a/app/javascript/mastodon/actions/dropdown_menu.js b/app/javascript/mastodon/actions/dropdown_menu.js
index 14f2939c7..fb6e55612 100644
--- a/app/javascript/mastodon/actions/dropdown_menu.js
+++ b/app/javascript/mastodon/actions/dropdown_menu.js
@@ -1,8 +1,8 @@
 export const DROPDOWN_MENU_OPEN = 'DROPDOWN_MENU_OPEN';
 export const DROPDOWN_MENU_CLOSE = 'DROPDOWN_MENU_CLOSE';
 
-export function openDropdownMenu(id, placement, keyboard) {
-  return { type: DROPDOWN_MENU_OPEN, id, placement, keyboard };
+export function openDropdownMenu(id, placement, keyboard, scroll_key) {
+  return { type: DROPDOWN_MENU_OPEN, id, placement, keyboard, scroll_key };
 }
 
 export function closeDropdownMenu(id) {
diff --git a/app/javascript/mastodon/components/blurhash.js b/app/javascript/mastodon/components/blurhash.js
new file mode 100644
index 000000000..2af5cfc56
--- /dev/null
+++ b/app/javascript/mastodon/components/blurhash.js
@@ -0,0 +1,65 @@
+// @ts-check
+
+import { decode } from 'blurhash';
+import React, { useRef, useEffect } from 'react';
+import PropTypes from 'prop-types';
+
+/**
+ * @typedef BlurhashPropsBase
+ * @property {string?} hash Hash to render
+ * @property {number} width
+ * Width of the blurred region in pixels. Defaults to 32
+ * @property {number} [height]
+ * Height of the blurred region in pixels. Defaults to width
+ * @property {boolean} [dummy]
+ * Whether dummy mode is enabled. If enabled, nothing is rendered
+ * and canvas left untouched
+ */
+
+/** @typedef {JSX.IntrinsicElements['canvas'] & BlurhashPropsBase} BlurhashProps */
+
+/**
+ * Component that is used to render blurred of blurhash string
+ *
+ * @param {BlurhashProps} param1 Props of the component
+ * @returns Canvas which will render blurred region element to embed
+ */
+function Blurhash({
+  hash,
+  width = 32,
+  height = width,
+  dummy = false,
+  ...canvasProps
+}) {
+  const canvasRef = /** @type {import('react').MutableRefObject<HTMLCanvasElement>} */ (useRef());
+
+  useEffect(() => {
+    const { current: canvas } = canvasRef;
+    canvas.width = canvas.width; // resets canvas
+
+    if (dummy || !hash) return;
+
+    try {
+      const pixels = decode(hash, width, height);
+      const ctx = canvas.getContext('2d');
+      const imageData = new ImageData(pixels, width, height);
+
+      ctx.putImageData(imageData, 0, 0);
+    } catch (err) {
+      console.error('Blurhash decoding failure', { err, hash });
+    }
+  }, [dummy, hash, width, height]);
+
+  return (
+    <canvas {...canvasProps} ref={canvasRef} width={width} height={height} />
+  );
+}
+
+Blurhash.propTypes = {
+  hash: PropTypes.string.isRequired,
+  width: PropTypes.number,
+  height: PropTypes.number,
+  dummy: PropTypes.bool,
+};
+
+export default React.memo(Blurhash);
diff --git a/app/javascript/mastodon/components/media_gallery.js b/app/javascript/mastodon/components/media_gallery.js
index 0ec866138..0a8f42585 100644
--- a/app/javascript/mastodon/components/media_gallery.js
+++ b/app/javascript/mastodon/components/media_gallery.js
@@ -7,8 +7,8 @@ import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import { isIOS } from '../is_mobile';
 import classNames from 'classnames';
 import { autoPlayGif, cropImages, displayMedia, useBlurhash } from '../initial_state';
-import { decode } from 'blurhash';
 import { debounce } from 'lodash';
+import Blurhash from 'mastodon/components/blurhash';
 
 const messages = defineMessages({
   toggle_visible: { id: 'media_gallery.toggle_visible', defaultMessage: 'Hide {number, plural, one {image} other {images}}' },
@@ -74,36 +74,6 @@ class Item extends React.PureComponent {
     e.stopPropagation();
   }
 
-  componentDidMount () {
-    if (this.props.attachment.get('blurhash')) {
-      this._decode();
-    }
-  }
-
-  componentDidUpdate (prevProps) {
-    if (prevProps.attachment.get('blurhash') !== this.props.attachment.get('blurhash') && this.props.attachment.get('blurhash')) {
-      this._decode();
-    }
-  }
-
-  _decode () {
-    if (!useBlurhash) return;
-
-    const hash   = this.props.attachment.get('blurhash');
-    const pixels = decode(hash, 32, 32);
-
-    if (pixels) {
-      const ctx       = this.canvas.getContext('2d');
-      const imageData = new ImageData(pixels, 32, 32);
-
-      ctx.putImageData(imageData, 0, 0);
-    }
-  }
-
-  setCanvasRef = c => {
-    this.canvas = c;
-  }
-
   handleImageLoad = () => {
     this.setState({ loaded: true });
   }
@@ -166,7 +136,11 @@ class Item extends React.PureComponent {
       return (
         <div className={classNames('media-gallery__item', { standalone })} key={attachment.get('id')} style={{ left: left, top: top, right: right, bottom: bottom, width: `${width}%`, height: `${height}%` }}>
           <a className='media-gallery__item-thumbnail' href={attachment.get('remote_url') || attachment.get('url')} style={{ cursor: 'pointer' }} title={attachment.get('description')} target='_blank' rel='noopener noreferrer'>
-            <canvas width={32} height={32} ref={this.setCanvasRef} className='media-gallery__preview' />
+            <Blurhash
+              hash={attachment.get('blurhash')}
+              className='media-gallery__preview'
+              dummy={!useBlurhash}
+            />
           </a>
         </div>
       );
@@ -232,7 +206,13 @@ class Item extends React.PureComponent {
 
     return (
       <div className={classNames('media-gallery__item', { standalone })} key={attachment.get('id')} style={{ left: left, top: top, right: right, bottom: bottom, width: `${width}%`, height: `${height}%` }}>
-        <canvas width={32} height={32} ref={this.setCanvasRef} className={classNames('media-gallery__preview', { 'media-gallery__preview--hidden': visible && this.state.loaded })} />
+        <Blurhash
+          hash={attachment.get('blurhash')}
+          dummy={!useBlurhash}
+          className={classNames('media-gallery__preview', {
+            'media-gallery__preview--hidden': visible && this.state.loaded,
+          })}
+        />
         {visible && thumbnail}
       </div>
     );
diff --git a/app/javascript/mastodon/components/scrollable_list.js b/app/javascript/mastodon/components/scrollable_list.js
index 7eb0910c9..35740f226 100644
--- a/app/javascript/mastodon/components/scrollable_list.js
+++ b/app/javascript/mastodon/components/scrollable_list.js
@@ -10,10 +10,18 @@ import { List as ImmutableList } from 'immutable';
 import classNames from 'classnames';
 import { attachFullscreenListener, detachFullscreenListener, isFullscreen } from '../features/ui/util/fullscreen';
 import LoadingIndicator from './loading_indicator';
+import { connect } from 'react-redux';
 
 const MOUSE_IDLE_DELAY = 300;
 
-export default class ScrollableList extends PureComponent {
+const mapStateToProps = (state, { scrollKey }) => {
+  return {
+    preventScroll: scrollKey === state.getIn(['dropdown_menu', 'scroll_key']),
+  };
+};
+
+export default @connect(mapStateToProps)
+class ScrollableList extends PureComponent {
 
   static contextTypes = {
     router: PropTypes.object,
@@ -37,6 +45,7 @@ export default class ScrollableList extends PureComponent {
     emptyMessage: PropTypes.node,
     children: PropTypes.node,
     bindToDocument: PropTypes.bool,
+    preventScroll: PropTypes.bool,
   };
 
   static defaultProps = {
@@ -129,7 +138,7 @@ export default class ScrollableList extends PureComponent {
   });
 
   handleMouseIdle = () => {
-    if (this.scrollToTopOnMouseIdle) {
+    if (this.scrollToTopOnMouseIdle && !this.props.preventScroll) {
       this.setScrollTop(0);
     }
 
@@ -179,7 +188,7 @@ export default class ScrollableList extends PureComponent {
       this.getFirstChildKey(prevProps) !== this.getFirstChildKey(this.props);
     const pendingChanged = (prevProps.numPending > 0) !== (this.props.numPending > 0);
 
-    if (pendingChanged || someItemInserted && (this.getScrollTop() > 0 || this.mouseMovedRecently)) {
+    if (pendingChanged || someItemInserted && (this.getScrollTop() > 0 || this.mouseMovedRecently || this.props.preventScroll)) {
       return this.getScrollHeight() - this.getScrollTop();
     } else {
       return null;
diff --git a/app/javascript/mastodon/components/status.js b/app/javascript/mastodon/components/status.js
index f9f6736e6..174e401b7 100644
--- a/app/javascript/mastodon/components/status.js
+++ b/app/javascript/mastodon/components/status.js
@@ -94,6 +94,7 @@ class Status extends ImmutablePureComponent {
     updateScrollBottom: PropTypes.func,
     cacheMediaWidth: PropTypes.func,
     cachedMediaWidth: PropTypes.number,
+    scrollKey: PropTypes.string,
   };
 
   // Avoid checking props that are functions (and whose equality will always
@@ -264,7 +265,7 @@ class Status extends ImmutablePureComponent {
     let media = null;
     let statusAvatar, prepend, rebloggedByText;
 
-    const { intl, hidden, featured, otherAccounts, unread, showThread } = this.props;
+    const { intl, hidden, featured, otherAccounts, unread, showThread, scrollKey } = this.props;
 
     let { status, account, ...other } = this.props;
 
@@ -459,7 +460,7 @@ class Status extends ImmutablePureComponent {
 
             {media}
 
-            <StatusActionBar status={status} account={account} {...other} />
+            <StatusActionBar scrollKey={scrollKey} status={status} account={account} {...other} />
           </div>
         </div>
       </HotKeys>
diff --git a/app/javascript/mastodon/components/status_action_bar.js b/app/javascript/mastodon/components/status_action_bar.js
index a4aa27088..231c517e9 100644
--- a/app/javascript/mastodon/components/status_action_bar.js
+++ b/app/javascript/mastodon/components/status_action_bar.js
@@ -85,6 +85,7 @@ class StatusActionBar extends ImmutablePureComponent {
     onPin: PropTypes.func,
     onBookmark: PropTypes.func,
     withDismiss: PropTypes.bool,
+    scrollKey: PropTypes.string,
     intl: PropTypes.object.isRequired,
   };
 
@@ -229,7 +230,7 @@ class StatusActionBar extends ImmutablePureComponent {
   }
 
   render () {
-    const { status, relationship, intl, withDismiss } = this.props;
+    const { status, relationship, intl, withDismiss, scrollKey } = this.props;
 
     const mutingConversation = status.get('muted');
     const anonymousAccess    = !me;
@@ -333,7 +334,16 @@ class StatusActionBar extends ImmutablePureComponent {
         {shareButton}
 
         <div className='status__action-bar-dropdown'>
-          <DropdownMenuContainer disabled={anonymousAccess} status={status} items={menu} icon='ellipsis-h' size={18} direction='right' title={intl.formatMessage(messages.more)} />
+          <DropdownMenuContainer
+            scrollKey={scrollKey}
+            disabled={anonymousAccess}
+            status={status}
+            items={menu}
+            icon='ellipsis-h'
+            size={18}
+            direction='right'
+            title={intl.formatMessage(messages.more)}
+          />
         </div>
       </div>
     );
diff --git a/app/javascript/mastodon/components/status_list.js b/app/javascript/mastodon/components/status_list.js
index e1b370c91..25411c127 100644
--- a/app/javascript/mastodon/components/status_list.js
+++ b/app/javascript/mastodon/components/status_list.js
@@ -99,6 +99,7 @@ export default class StatusList extends ImmutablePureComponent {
           onMoveUp={this.handleMoveUp}
           onMoveDown={this.handleMoveDown}
           contextType={timelineId}
+          scrollKey={this.props.scrollKey}
           showThread
         />
       ))
diff --git a/app/javascript/mastodon/containers/dropdown_menu_container.js b/app/javascript/mastodon/containers/dropdown_menu_container.js
index ab1823194..6ec9bbffd 100644
--- a/app/javascript/mastodon/containers/dropdown_menu_container.js
+++ b/app/javascript/mastodon/containers/dropdown_menu_container.js
@@ -12,7 +12,7 @@ const mapStateToProps = state => ({
   openedViaKeyboard: state.getIn(['dropdown_menu', 'keyboard']),
 });
 
-const mapDispatchToProps = (dispatch, { status, items }) => ({
+const mapDispatchToProps = (dispatch, { status, items, scrollKey }) => ({
   onOpen(id, onItemClick, dropdownPlacement, keyboard) {
     if (status) {
       dispatch(fetchRelationships([status.getIn(['account', 'id'])]));
@@ -22,7 +22,7 @@ const mapDispatchToProps = (dispatch, { status, items }) => ({
       status,
       actions: items,
       onClick: onItemClick,
-    }) : openDropdownMenu(id, dropdownPlacement, keyboard));
+    }) : openDropdownMenu(id, dropdownPlacement, keyboard, scrollKey));
   },
 
   onClose(id) {
diff --git a/app/javascript/mastodon/features/account/components/header.js b/app/javascript/mastodon/features/account/components/header.js
index b5aca574f..9613b0b9e 100644
--- a/app/javascript/mastodon/features/account/components/header.js
+++ b/app/javascript/mastodon/features/account/components/header.js
@@ -47,7 +47,6 @@ const messages = defineMessages({
   unendorse: { id: 'account.unendorse', defaultMessage: 'Don\'t feature on profile' },
   add_or_remove_from_list: { id: 'account.add_or_remove_from_list', defaultMessage: 'Add or Remove from lists' },
   admin_account: { id: 'status.admin_account', defaultMessage: 'Open moderation interface for @{name}' },
-  add_account_note: { id: 'account.add_account_note', defaultMessage: 'Add note for @{name}' },
 });
 
 const dateFormatOptions = {
diff --git a/app/javascript/mastodon/features/account_gallery/components/media_item.js b/app/javascript/mastodon/features/account_gallery/components/media_item.js
index 617a45d16..9eb4ed0d3 100644
--- a/app/javascript/mastodon/features/account_gallery/components/media_item.js
+++ b/app/javascript/mastodon/features/account_gallery/components/media_item.js
@@ -1,7 +1,7 @@
-import { decode } from 'blurhash';
+import Blurhash from 'mastodon/components/blurhash';
 import classNames from 'classnames';
 import Icon from 'mastodon/components/icon';
-import { autoPlayGif, displayMedia } from 'mastodon/initial_state';
+import { autoPlayGif, displayMedia, useBlurhash } from 'mastodon/initial_state';
 import { isIOS } from 'mastodon/is_mobile';
 import PropTypes from 'prop-types';
 import React from 'react';
@@ -21,34 +21,6 @@ export default class MediaItem extends ImmutablePureComponent {
     loaded: false,
   };
 
-  componentDidMount () {
-    if (this.props.attachment.get('blurhash')) {
-      this._decode();
-    }
-  }
-
-  componentDidUpdate (prevProps) {
-    if (prevProps.attachment.get('blurhash') !== this.props.attachment.get('blurhash') && this.props.attachment.get('blurhash')) {
-      this._decode();
-    }
-  }
-
-  _decode () {
-    const hash   = this.props.attachment.get('blurhash');
-    const pixels = decode(hash, 32, 32);
-
-    if (pixels) {
-      const ctx       = this.canvas.getContext('2d');
-      const imageData = new ImageData(pixels, 32, 32);
-
-      ctx.putImageData(imageData, 0, 0);
-    }
-  }
-
-  setCanvasRef = c => {
-    this.canvas = c;
-  }
-
   handleImageLoad = () => {
     this.setState({ loaded: true });
   }
@@ -152,7 +124,13 @@ export default class MediaItem extends ImmutablePureComponent {
     return (
       <div className='account-gallery__item' style={{ width, height }}>
         <a className='media-gallery__item-thumbnail' href={status.get('url')} onClick={this.handleClick} title={title} target='_blank' rel='noopener noreferrer'>
-          <canvas width={32} height={32} ref={this.setCanvasRef} className={classNames('media-gallery__preview', { 'media-gallery__preview--hidden': visible && loaded })} />
+          <Blurhash
+            hash={attachment.get('blurhash')}
+            className={classNames('media-gallery__preview', {
+              'media-gallery__preview--hidden': visible && loaded,
+            })}
+            dummy={!useBlurhash}
+          />
           {visible && thumbnail}
           {!visible && icon}
         </a>
diff --git a/app/javascript/mastodon/features/audio/index.js b/app/javascript/mastodon/features/audio/index.js
index f0cd79873..a49489257 100644
--- a/app/javascript/mastodon/features/audio/index.js
+++ b/app/javascript/mastodon/features/audio/index.js
@@ -7,11 +7,7 @@ import classNames from 'classnames';
 import { throttle } from 'lodash';
 import { getPointerPosition, fileNameFromURL } from 'mastodon/features/video';
 import { debounce } from 'lodash';
-
-const hex2rgba = (hex, alpha = 1) => {
-  const [r, g, b] = hex.match(/\w\w/g).map(x => parseInt(x, 16));
-  return `rgba(${r}, ${g}, ${b}, ${alpha})`;
-};
+import Visualizer from './visualizer';
 
 const messages = defineMessages({
   play: { id: 'video.play', defaultMessage: 'Play' },
@@ -54,6 +50,11 @@ class Audio extends React.PureComponent {
     dragging: false,
   };
 
+  constructor (props) {
+    super(props);
+    this.visualizer = new Visualizer(TICK_SIZE);
+  }
+
   setPlayerRef = c => {
     this.player = c;
 
@@ -92,9 +93,7 @@ class Audio extends React.PureComponent {
   setCanvasRef = c => {
     this.canvas = c;
 
-    if (c) {
-      this.canvasContext = c.getContext('2d');
-    }
+    this.visualizer.setCanvas(c);
   }
 
   componentDidMount () {
@@ -262,17 +261,12 @@ class Audio extends React.PureComponent {
 
   _initAudioContext () {
     const context  = new AudioContext();
-    const analyser = context.createAnalyser();
     const source   = context.createMediaElementSource(this.audio);
 
-    analyser.smoothingTimeConstant = 0.6;
-    analyser.fftSize = 2048;
-
-    source.connect(analyser);
+    this.visualizer.setAudioContext(context, source);
     source.connect(context.destination);
 
     this.audioContext = context;
-    this.analyser = analyser;
   }
 
   handleDownload = () => {
@@ -305,20 +299,12 @@ class Audio extends React.PureComponent {
     });
   }
 
-  _clear () {
-    this.canvasContext.clearRect(0, 0, this.state.width, this.state.height);
+  _clear() {
+    this.visualizer.clear(this.state.width, this.state.height);
   }
 
-  _draw () {
-    this.canvasContext.save();
-
-    const ticks = this._getTicks(360 * this._getScaleCoefficient(), TICK_SIZE);
-
-    ticks.forEach(tick => {
-      this._drawTick(tick.x1, tick.y1, tick.x2, tick.y2);
-    });
-
-    this.canvasContext.restore();
+  _draw() {
+    this.visualizer.draw(this._getCX(), this._getCY(), this._getAccentColor(), this._getRadius(), this._getScaleCoefficient());
   }
 
   _getRadius () {
@@ -329,126 +315,6 @@ class Audio extends React.PureComponent {
     return (this.state.height || this.props.height) / 982;
   }
 
-  _getTicks (count, size, animationParams = [0, 90]) {
-    const radius = this._getRadius();
-    const ticks = this._getTickPoints(count);
-    const lesser = 200;
-    const m = [];
-    const bufferLength = this.analyser ? this.analyser.frequencyBinCount : 0;
-    const frequencyData = new Uint8Array(bufferLength);
-    const allScales = [];
-    const scaleCoefficient = this._getScaleCoefficient();
-
-    if (this.analyser) {
-      this.analyser.getByteFrequencyData(frequencyData);
-    }
-
-    ticks.forEach((tick, i) => {
-      const coef = 1 - i / (ticks.length * 2.5);
-
-      let delta = ((frequencyData[i] || 0) - lesser * coef) * scaleCoefficient;
-
-      if (delta < 0) {
-        delta = 0;
-      }
-
-      let k;
-
-      if (animationParams[0] <= tick.angle && tick.angle <= animationParams[1]) {
-        k = radius / (radius - this._getSize(tick.angle, animationParams[0], animationParams[1]) - delta);
-      } else {
-        k = radius / (radius - (size + delta));
-      }
-
-      const x1 = tick.x * (radius - size);
-      const y1 = tick.y * (radius - size);
-      const x2 = x1 * k;
-      const y2 = y1 * k;
-
-      m.push({ x1, y1, x2, y2 });
-
-      if (i < 20) {
-        let scale = delta / (200 * scaleCoefficient);
-        scale = scale < 1 ? 1 : scale;
-        allScales.push(scale);
-      }
-    });
-
-    const scale = allScales.reduce((pv, cv) => pv + cv, 0) / allScales.length;
-
-    return m.map(({ x1, y1, x2, y2 }) => ({
-      x1: x1,
-      y1: y1,
-      x2: x2 * scale,
-      y2: y2 * scale,
-    }));
-  }
-
-  _getSize (angle, l, r) {
-    const scaleCoefficient = this._getScaleCoefficient();
-    const maxTickSize = TICK_SIZE * 9 * scaleCoefficient;
-    const m = (r - l) / 2;
-    const x = (angle - l);
-
-    let h;
-
-    if (x === m) {
-      return maxTickSize;
-    }
-
-    const d = Math.abs(m - x);
-    const v = 40 * Math.sqrt(1 / d);
-
-    if (v > maxTickSize) {
-      h = maxTickSize;
-    } else {
-      h = Math.max(TICK_SIZE, v);
-    }
-
-    return h;
-  }
-
-  _getTickPoints (count) {
-    const PI = 360;
-    const coords = [];
-    const step = PI / count;
-
-    let rad;
-
-    for(let deg = 0; deg < PI; deg += step) {
-      rad = deg * Math.PI / (PI / 2);
-      coords.push({ x: Math.cos(rad), y: -Math.sin(rad), angle: deg });
-    }
-
-    return coords;
-  }
-
-  _drawTick (x1, y1, x2, y2) {
-    const cx = this._getCX();
-    const cy = this._getCY();
-
-    const dx1 = Math.ceil(cx + x1);
-    const dy1 = Math.ceil(cy + y1);
-    const dx2 = Math.ceil(cx + x2);
-    const dy2 = Math.ceil(cy + y2);
-
-    const gradient = this.canvasContext.createLinearGradient(dx1, dy1, dx2, dy2);
-
-    const mainColor = this._getAccentColor();
-    const lastColor = hex2rgba(mainColor, 0);
-
-    gradient.addColorStop(0, mainColor);
-    gradient.addColorStop(0.6, mainColor);
-    gradient.addColorStop(1, lastColor);
-
-    this.canvasContext.beginPath();
-    this.canvasContext.strokeStyle = gradient;
-    this.canvasContext.lineWidth = 2;
-    this.canvasContext.moveTo(dx1, dy1);
-    this.canvasContext.lineTo(dx2, dy2);
-    this.canvasContext.stroke();
-  }
-
   _getCX() {
     return Math.floor(this.state.width / 2);
   }
diff --git a/app/javascript/mastodon/features/audio/visualizer.js b/app/javascript/mastodon/features/audio/visualizer.js
new file mode 100644
index 000000000..77d5b5a65
--- /dev/null
+++ b/app/javascript/mastodon/features/audio/visualizer.js
@@ -0,0 +1,136 @@
+/*
+Copyright (c) 2020 by Alex Permyakov (https://codepen.io/alexdevp/pen/RNELPV)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+const hex2rgba = (hex, alpha = 1) => {
+  const [r, g, b] = hex.match(/\w\w/g).map(x => parseInt(x, 16));
+  return `rgba(${r}, ${g}, ${b}, ${alpha})`;
+};
+
+export default class Visualizer {
+
+  constructor (tickSize) {
+    this.tickSize = tickSize;
+  }
+
+  setCanvas(canvas) {
+    this.canvas = canvas;
+    if (canvas) {
+      this.context = canvas.getContext('2d');
+    }
+  }
+
+  setAudioContext(context, source) {
+    const analyser = context.createAnalyser();
+
+    analyser.smoothingTimeConstant = 0.6;
+    analyser.fftSize = 2048;
+
+    source.connect(analyser);
+
+    this.analyser = analyser;
+  }
+
+  getTickPoints (count) {
+    const coords = [];
+
+    for(let i = 0; i < count; i++) {
+      const rad = Math.PI * 2 * i / count;
+      coords.push({ x: Math.cos(rad), y: -Math.sin(rad) });
+    }
+
+    return coords;
+  }
+
+  drawTick (cx, cy, mainColor, x1, y1, x2, y2) {
+    const dx1 = Math.ceil(cx + x1);
+    const dy1 = Math.ceil(cy + y1);
+    const dx2 = Math.ceil(cx + x2);
+    const dy2 = Math.ceil(cy + y2);
+
+    const gradient = this.context.createLinearGradient(dx1, dy1, dx2, dy2);
+
+    const lastColor = hex2rgba(mainColor, 0);
+
+    gradient.addColorStop(0, mainColor);
+    gradient.addColorStop(0.6, mainColor);
+    gradient.addColorStop(1, lastColor);
+
+    this.context.beginPath();
+    this.context.strokeStyle = gradient;
+    this.context.lineWidth = 2;
+    this.context.moveTo(dx1, dy1);
+    this.context.lineTo(dx2, dy2);
+    this.context.stroke();
+  }
+
+  getTicks (count, size, radius, scaleCoefficient) {
+    const ticks = this.getTickPoints(count);
+    const lesser = 200;
+    const m = [];
+    const bufferLength = this.analyser ? this.analyser.frequencyBinCount : 0;
+    const frequencyData = new Uint8Array(bufferLength);
+    const allScales = [];
+
+    if (this.analyser) {
+      this.analyser.getByteFrequencyData(frequencyData);
+    }
+
+    ticks.forEach((tick, i) => {
+      const coef = 1 - i / (ticks.length * 2.5);
+
+      let delta = ((frequencyData[i] || 0) - lesser * coef) * scaleCoefficient;
+
+      if (delta < 0) {
+        delta = 0;
+      }
+
+      const k = radius / (radius - (size + delta));
+
+      const x1 = tick.x * (radius - size);
+      const y1 = tick.y * (radius - size);
+      const x2 = x1 * k;
+      const y2 = y1 * k;
+
+      m.push({ x1, y1, x2, y2 });
+
+      if (i < 20) {
+        let scale = delta / (200 * scaleCoefficient);
+        scale = scale < 1 ? 1 : scale;
+        allScales.push(scale);
+      }
+    });
+
+    const scale = allScales.reduce((pv, cv) => pv + cv, 0) / allScales.length;
+
+    return m.map(({ x1, y1, x2, y2 }) => ({
+      x1: x1,
+      y1: y1,
+      x2: x2 * scale,
+      y2: y2 * scale,
+    }));
+  }
+
+  clear (width, height) {
+    this.context.clearRect(0, 0, width, height);
+  }
+
+  draw (cx, cy, color, radius, coefficient) {
+    this.context.save();
+
+    const ticks = this.getTicks(parseInt(360 * coefficient), this.tickSize, radius, coefficient);
+
+    ticks.forEach(tick => {
+      this.drawTick(cx, cy, color, tick.x1, tick.y1, tick.x2, tick.y2);
+    });
+
+    this.context.restore();
+  }
+
+}
diff --git a/app/javascript/mastodon/features/direct_timeline/components/conversation.js b/app/javascript/mastodon/features/direct_timeline/components/conversation.js
index f9e45067f..6ecc27fac 100644
--- a/app/javascript/mastodon/features/direct_timeline/components/conversation.js
+++ b/app/javascript/mastodon/features/direct_timeline/components/conversation.js
@@ -36,6 +36,7 @@ class Conversation extends ImmutablePureComponent {
     accounts: ImmutablePropTypes.list.isRequired,
     lastStatus: ImmutablePropTypes.map,
     unread:PropTypes.bool.isRequired,
+    scrollKey: PropTypes.string,
     onMoveUp: PropTypes.func,
     onMoveDown: PropTypes.func,
     markRead: PropTypes.func.isRequired,
@@ -127,7 +128,7 @@ class Conversation extends ImmutablePureComponent {
   }
 
   render () {
-    const { accounts, lastStatus, unread, intl } = this.props;
+    const { accounts, lastStatus, unread, scrollKey, intl } = this.props;
 
     if (lastStatus === null) {
       return null;
@@ -194,7 +195,15 @@ class Conversation extends ImmutablePureComponent {
               <IconButton className='status__action-bar-button' title={intl.formatMessage(messages.reply)} icon='reply' onClick={this.handleReply} />
 
               <div className='status__action-bar-dropdown'>
-                <DropdownMenuContainer status={lastStatus} items={menu} icon='ellipsis-h' size={18} direction='right' title={intl.formatMessage(messages.more)} />
+                <DropdownMenuContainer
+                  scrollKey={scrollKey}
+                  status={lastStatus}
+                  items={menu}
+                  icon='ellipsis-h'
+                  size={18}
+                  direction='right'
+                  title={intl.formatMessage(messages.more)}
+                />
               </div>
             </div>
           </div>
diff --git a/app/javascript/mastodon/features/direct_timeline/components/conversations_list.js b/app/javascript/mastodon/features/direct_timeline/components/conversations_list.js
index 8867bbd73..4ee8e5212 100644
--- a/app/javascript/mastodon/features/direct_timeline/components/conversations_list.js
+++ b/app/javascript/mastodon/features/direct_timeline/components/conversations_list.js
@@ -10,6 +10,7 @@ export default class ConversationsList extends ImmutablePureComponent {
 
   static propTypes = {
     conversations: ImmutablePropTypes.list.isRequired,
+    scrollKey: PropTypes.string.isRequired,
     hasMore: PropTypes.bool,
     isLoading: PropTypes.bool,
     onLoadMore: PropTypes.func,
@@ -58,13 +59,14 @@ export default class ConversationsList extends ImmutablePureComponent {
     const { conversations, onLoadMore, ...other } = this.props;
 
     return (
-      <ScrollableList {...other} onLoadMore={onLoadMore && this.handleLoadOlder} scrollKey='direct' ref={this.setRef}>
+      <ScrollableList {...other} onLoadMore={onLoadMore && this.handleLoadOlder} ref={this.setRef}>
         {conversations.map(item => (
           <ConversationContainer
             key={item.get('id')}
             conversationId={item.get('id')}
             onMoveUp={this.handleMoveUp}
             onMoveDown={this.handleMoveDown}
+            scrollKey={this.props.scrollKey}
           />
         ))}
       </ScrollableList>
diff --git a/app/javascript/mastodon/features/status/components/card.js b/app/javascript/mastodon/features/status/components/card.js
index 971682df8..90f9ae7ae 100644
--- a/app/javascript/mastodon/features/status/components/card.js
+++ b/app/javascript/mastodon/features/status/components/card.js
@@ -7,7 +7,7 @@ import punycode from 'punycode';
 import classnames from 'classnames';
 import Icon from 'mastodon/components/icon';
 import { useBlurhash } from 'mastodon/initial_state';
-import { decode } from 'blurhash';
+import Blurhash from 'mastodon/components/blurhash';
 import { debounce } from 'lodash';
 
 const IDNA_PREFIX = 'xn--';
@@ -93,38 +93,12 @@ export default class Card extends React.PureComponent {
 
   componentDidMount () {
     window.addEventListener('resize', this.handleResize, { passive: true });
-
-    if (this.props.card && this.props.card.get('blurhash') && this.canvas) {
-      this._decode();
-    }
   }
 
   componentWillUnmount () {
     window.removeEventListener('resize', this.handleResize);
   }
 
-  componentDidUpdate (prevProps) {
-    const { card } = this.props;
-
-    if (card.get('blurhash') && (!prevProps.card || prevProps.card.get('blurhash') !== card.get('blurhash')) && this.canvas) {
-      this._decode();
-    }
-  }
-
-  _decode () {
-    if (!useBlurhash) return;
-
-    const hash   = this.props.card.get('blurhash');
-    const pixels = decode(hash, 32, 32);
-
-    if (pixels) {
-      const ctx       = this.canvas.getContext('2d');
-      const imageData = new ImageData(pixels, 32, 32);
-
-      ctx.putImageData(imageData, 0, 0);
-    }
-  }
-
   _setDimensions () {
     const width = this.node.offsetWidth;
 
@@ -182,10 +156,6 @@ export default class Card extends React.PureComponent {
     }
   }
 
-  setCanvasRef = c => {
-    this.canvas = c;
-  }
-
   handleImageLoad = () => {
     this.setState({ previewLoaded: true });
   }
@@ -238,7 +208,15 @@ export default class Card extends React.PureComponent {
     );
 
     let embed     = '';
-    let canvas = <canvas width={32} height={32} ref={this.setCanvasRef} className={classnames('status-card__image-preview', { 'status-card__image-preview--hidden' : revealed && this.state.previewLoaded })} />;
+    let canvas = (
+      <Blurhash
+        className={classnames('status-card__image-preview', {
+          'status-card__image-preview--hidden': revealed && this.state.previewLoaded,
+        })}
+        hash={card.get('blurhash')}
+        dummy={!useBlurhash}
+      />
+    );
     let thumbnail = <img src={card.get('image')} alt='' style={{ width: horizontal ? width : null, height: horizontal ? height : null, visibility: revealed ? null : 'hidden' }} onLoad={this.handleImageLoad} className='status-card__image-image' />;
     let spoilerButton = (
       <button type='button' onClick={this.handleReveal} className='spoiler-button__overlay'>
diff --git a/app/javascript/mastodon/features/video/index.js b/app/javascript/mastodon/features/video/index.js
index 135200a3d..fb12567f0 100644
--- a/app/javascript/mastodon/features/video/index.js
+++ b/app/javascript/mastodon/features/video/index.js
@@ -7,7 +7,7 @@ import classNames from 'classnames';
 import { isFullscreen, requestFullscreen, exitFullscreen } from '../ui/util/fullscreen';
 import { displayMedia, useBlurhash } from '../../initial_state';
 import Icon from 'mastodon/components/icon';
-import { decode } from 'blurhash';
+import Blurhash from 'mastodon/components/blurhash';
 
 const messages = defineMessages({
   play: { id: 'video.play', defaultMessage: 'Play' },
@@ -169,10 +169,6 @@ class Video extends React.PureComponent {
     this.volume = c;
   }
 
-  setCanvasRef = c => {
-    this.canvas = c;
-  }
-
   handleClickRoot = e => e.stopPropagation();
 
   handlePlay = () => {
@@ -289,10 +285,6 @@ class Video extends React.PureComponent {
 
     window.addEventListener('scroll', this.handleScroll);
     window.addEventListener('resize', this.handleResize, { passive: true });
-
-    if (this.props.blurhash) {
-      this._decode();
-    }
   }
 
   componentWillUnmount () {
@@ -315,24 +307,6 @@ class Video extends React.PureComponent {
     if (prevState.revealed && !this.state.revealed && this.video) {
       this.video.pause();
     }
-
-    if (prevProps.blurhash !== this.props.blurhash && this.props.blurhash) {
-      this._decode();
-    }
-  }
-
-  _decode () {
-    if (!useBlurhash) return;
-
-    const hash   = this.props.blurhash;
-    const pixels = decode(hash, 32, 32);
-
-    if (pixels) {
-      const ctx       = this.canvas.getContext('2d');
-      const imageData = new ImageData(pixels, 32, 32);
-
-      ctx.putImageData(imageData, 0, 0);
-    }
   }
 
   handleResize = debounce(() => {
@@ -438,7 +412,7 @@ class Video extends React.PureComponent {
   }
 
   render () {
-    const { preview, src, inline, startTime, onOpenVideo, onCloseVideo, intl, alt, detailed, sensitive, link, editable } = this.props;
+    const { preview, src, inline, startTime, onOpenVideo, onCloseVideo, intl, alt, detailed, sensitive, link, editable, blurhash } = this.props;
     const { containerWidth, currentTime, duration, volume, buffer, dragging, paused, fullscreen, hovered, muted, revealed } = this.state;
     const progress = (currentTime / duration) * 100;
     const playerStyle = {};
@@ -481,7 +455,13 @@ class Video extends React.PureComponent {
         onClick={this.handleClickRoot}
         tabIndex={0}
       >
-        <canvas width={32} height={32} ref={this.setCanvasRef} className={classNames('media-gallery__preview', { 'media-gallery__preview--hidden': revealed })} />
+        <Blurhash
+          hash={blurhash}
+          className={classNames('media-gallery__preview', {
+            'media-gallery__preview--hidden': revealed,
+          })}
+          dummy={!useBlurhash}
+        />
 
         {(revealed || editable) && <video
           ref={this.setVideoRef}
diff --git a/app/javascript/mastodon/locales/defaultMessages.json b/app/javascript/mastodon/locales/defaultMessages.json
index 641699880..02399a1e6 100644
--- a/app/javascript/mastodon/locales/defaultMessages.json
+++ b/app/javascript/mastodon/locales/defaultMessages.json
@@ -142,6 +142,23 @@
   {
     "descriptors": [
       {
+        "defaultMessage": "{count, plural, one {{counter} Toot} other {{counter} Toots}}",
+        "id": "account.statuses_counter"
+      },
+      {
+        "defaultMessage": "{count, plural, other {{counter} Following}}",
+        "id": "account.following_counter"
+      },
+      {
+        "defaultMessage": "{count, plural, one {{counter} Follower} other {{counter} Followers}}",
+        "id": "account.followers_counter"
+      }
+    ],
+    "path": "app/javascript/mastodon/components/common_counter.json"
+  },
+  {
+    "descriptors": [
+      {
         "defaultMessage": "Unblock domain {domain}",
         "id": "account.unblock_domain"
       }
@@ -172,8 +189,8 @@
   {
     "descriptors": [
       {
-        "defaultMessage": "{count} {rawCount, plural, one {person} other {people}} talking",
-        "id": "trends.count_by_accounts"
+        "defaultMessage": "{count, plural, one {{counter} person} other {{counter} people}} talking",
+        "id": "trends.counter_by_accounts"
       }
     ],
     "path": "app/javascript/mastodon/components/hashtag.json"
@@ -343,6 +360,23 @@
   {
     "descriptors": [
       {
+        "defaultMessage": "{count}K",
+        "id": "units.short.thousand"
+      },
+      {
+        "defaultMessage": "{count}M",
+        "id": "units.short.million"
+      },
+      {
+        "defaultMessage": "{count}B",
+        "id": "units.short.billion"
+      }
+    ],
+    "path": "app/javascript/mastodon/components/short_number.json"
+  },
+  {
+    "descriptors": [
+      {
         "defaultMessage": "Delete",
         "id": "status.delete"
       },
@@ -833,18 +867,6 @@
       {
         "defaultMessage": "Group",
         "id": "account.badges.group"
-      },
-      {
-        "defaultMessage": "Toots",
-        "id": "account.posts"
-      },
-      {
-        "defaultMessage": "Follows",
-        "id": "account.follows"
-      },
-      {
-        "defaultMessage": "Followers",
-        "id": "account.followers"
       }
     ],
     "path": "app/javascript/mastodon/features/account/components/header.json"
diff --git a/app/javascript/mastodon/locales/en.json b/app/javascript/mastodon/locales/en.json
index 77b9a4f62..cdd147191 100644
--- a/app/javascript/mastodon/locales/en.json
+++ b/app/javascript/mastodon/locales/en.json
@@ -15,7 +15,8 @@
   "account.follow": "Follow",
   "account.followers": "Followers",
   "account.followers.empty": "No one follows this user yet.",
-  "account.follows": "Follows",
+  "account.followers_counter": "{count, plural, one {{counter} Follower} other {{counter} Followers}}",
+  "account.following_counter": "{count, plural, other {{counter} Following}}",
   "account.follows.empty": "This user doesn't follow anyone yet.",
   "account.follows_you": "Follows you",
   "account.hide_reblogs": "Hide boosts from @{name}",
@@ -35,6 +36,7 @@
   "account.requested": "Awaiting approval. Click to cancel follow request",
   "account.share": "Share @{name}'s profile",
   "account.show_reblogs": "Show boosts from @{name}",
+  "account.statuses_counter": "{count, plural, one {{counter} Toot} other {{counter} Toots}}",
   "account.unblock": "Unblock @{name}",
   "account.unblock_domain": "Unblock domain {domain}",
   "account.unendorse": "Don't feature on profile",
@@ -426,9 +428,12 @@
   "timeline_hint.resources.followers": "Followers",
   "timeline_hint.resources.follows": "Follows",
   "timeline_hint.resources.statuses": "Older toots",
-  "trends.count_by_accounts": "{count} {rawCount, plural, one {person} other {people}} talking",
+  "trends.counter_by_accounts": "{count, plural, one {{counter} person} other {{counter} people}} talking",
   "trends.trending_now": "Trending now",
   "ui.beforeunload": "Your draft will be lost if you leave Mastodon.",
+  "units.short.billion": "{count}B",
+  "units.short.million": "{count}M",
+  "units.short.thousand": "{count}K",
   "upload_area.title": "Drag & drop to upload",
   "upload_button.label": "Add images, a video or an audio file",
   "upload_error.limit": "File upload limit exceeded.",
diff --git a/app/javascript/mastodon/reducers/dropdown_menu.js b/app/javascript/mastodon/reducers/dropdown_menu.js
index 36fd4f132..a78a11acc 100644
--- a/app/javascript/mastodon/reducers/dropdown_menu.js
+++ b/app/javascript/mastodon/reducers/dropdown_menu.js
@@ -4,14 +4,14 @@ import {
   DROPDOWN_MENU_CLOSE,
 } from '../actions/dropdown_menu';
 
-const initialState = Immutable.Map({ openId: null, placement: null, keyboard: false });
+const initialState = Immutable.Map({ openId: null, placement: null, keyboard: false, scroll_key: null });
 
 export default function dropdownMenu(state = initialState, action) {
   switch (action.type) {
   case DROPDOWN_MENU_OPEN:
-    return state.merge({ openId: action.id, placement: action.placement, keyboard: action.keyboard });
+    return state.merge({ openId: action.id, placement: action.placement, keyboard: action.keyboard, scroll_key: action.scroll_key });
   case DROPDOWN_MENU_CLOSE:
-    return state.get('openId') === action.id ? state.set('openId', null) : state;
+    return state.get('openId') === action.id ? state.set('openId', null).set('scroll_key', null) : state;
   default:
     return state;
   }