[Glitch] Fix “slow mode” issues

Port f1098675782944fe1dabec71cd58d3d091da06a0 to glitch-soc

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/app/javascript/flavours/glitch/components/scrollable_list.js b/app/javascript/flavours/glitch/components/scrollable_list.js
index 5f42bdd8b..7c0b6d082 100644
--- a/app/javascript/flavours/glitch/components/scrollable_list.js
+++ b/app/javascript/flavours/glitch/components/scrollable_list.js
@@ -153,7 +153,9 @@ export default class ScrollableList extends PureComponent {
     const someItemInserted = React.Children.count(prevProps.children) > 0 &&
       React.Children.count(prevProps.children) < React.Children.count(this.props.children) &&
       this.getFirstChildKey(prevProps) !== this.getFirstChildKey(this.props);
-    if (someItemInserted && (this.node.scrollTop > 0 || this.mouseMovedRecently)) {
+    const pendingChanged = (prevProps.numPending > 0) !== (this.props.numPending > 0);
+
+    if (pendingChanged || someItemInserted && (this.node.scrollTop > 0 || this.mouseMovedRecently)) {
       return this.node.scrollHeight - this.node.scrollTop;
     } else {
       return null;
@@ -228,6 +230,13 @@ export default class ScrollableList extends PureComponent {
   handleLoadPending = e => {
     e.preventDefault();
     this.props.onLoadPending();
+    // Prevent the weird scroll-jumping behavior, as we explicitly don't want to
+    // scroll to top, and we know the scroll height is going to change
+    this.scrollToTopOnMouseIdle = false;
+    this.lastScrollWasSynthetic = false;
+    this.clearMouseIdleTimer();
+    this.mouseIdleTimer = setTimeout(this.handleMouseIdle, MOUSE_IDLE_DELAY);
+    this.mouseMovedRecently = true;
   }
 
   render () {