Merge pull request #6669 from matrix-org/palid/fix/difficult-to-grab-scrollbar

Fix remaining scrollbar/background blur regressions

Author: Palid

res/css/structures/_LeftPanel.scss

@@ -50,6 +50,7 @@ $roomListCollapsedWidth: 68px;
     contain: content;
     position: relative;
     flex-grow: 1;
+    overflow: hidden;
 
     // Note: The 'room list' in this context is actually everything that isn't the tag
     // panel, such as the menu options, breadcrumbs, filtering, etc

src/resizer/resizer.ts

@@ -78,7 +78,7 @@ export default class Resizer<C extends IConfig = IConfig> {
     }
 
     public attach() {
-        const attachment = this?.config?.handler.parentElement ?? this.container;
+        const attachment = this?.config?.handler?.parentElement ?? this.container;
         attachment.addEventListener("mousedown", this.onMouseDown, false);
         window.addEventListener("resize", this.onResize);
     }