Fix scroll-jumps when jumping to a permalink

src/components/structures/ScrollPanel.tsx

@@ -232,7 +232,15 @@ export default class ScrollPanel extends React.Component<IProps> {
 
     private onScroll = (ev: Event): void => {
         // skip scroll events caused by resizing
-        if (this.props.resizeNotifier && this.props.resizeNotifier.isResizing) return;
+        if (this.props.resizeNotifier && this.props.resizeNotifier.isResizing) {
+            debuglog("skipping onScroll due to isResizing", this.getScrollNode().scrollTop);
+            return;
+        }
+        // skip scroll events which are triggered by backfilling (i.e. while loading permalinks)
+        if (this.isFilling) {
+            debuglog("skipping onScroll due to isFilling", this.getScrollNode().scrollTop);
+            return;
+        }
         debuglog("onScroll called past resize gate; scroll node top:", this.getScrollNode().scrollTop);
         this.scrollTimeout?.restart();
         this.saveScrollState();