fix: Fixed using scrollbar on tabs moves the window around, b=closes #9699, c=common, compact-mode, folders, tabs, workspaces

src/zen/workspaces/ZenWorkspace.mjs

@@ -27,6 +27,7 @@
             </hbox>
           </vbox>
         </arrowscrollbox>
+        <vbox class="zen-workspace-empty-space" flex="1" />
       `;
     }
 

src/zen/workspaces/ZenWorkspaces.mjs

@@ -926,6 +926,7 @@ var gZenWorkspaces = new (class extends nsZenMultiWindowFeature {
     await this.initializeTabsStripSections();
     this._initializeEmptyTab();
     await gZenPinnedTabManager.refreshPinnedTabs({ init: true });
+    this._invalidateBookmarkContainers();
     await this.changeWorkspace(activeWorkspace, { onInit: true });
     this.#fixTabPositions();
     this.onWindowResize();

src/zen/workspaces/zen-workspaces.css

@@ -317,14 +317,13 @@ zen-workspace {
         opacity: 1;
       }
     }
-
-    &,
-    & .zen-workspace-normal-tabs-section {
-      height: 100%;
-    }
   }
 }
 
+.zen-workspace-empty-space {
+  -moz-window-dragging: drag;
+}
+
 /** Customiable UI, this is an auto generated ID */
 #wrapper-zen-workspaces-button {
   width: 100%;