fix: Fixed compact mode twitching when hovering the urlbar, b=closes #9790, c=compact-mode

src/zen/compact-mode/ZenCompactMode.mjs

@@ -585,7 +585,6 @@ var gZenCompactModeManager = {
               gZenVerticalTabsManager._hasSetSingleToolbar) ||
             this._hasHoveredUrlbar
           ) {
-            delete this._hasHoveredUrlbar;
             return;
           }
 
@@ -642,6 +641,16 @@ var gZenCompactModeManager = {
         }
       }, this.HOVER_HACK_DELAY);
     });
+
+    gURLBar.textbox.addEventListener('mouseleave', () => {
+      setTimeout(() => {
+        setTimeout(() => {
+          requestAnimationFrame(() => {
+            delete this._hasHoveredUrlbar;
+          });
+        }, 0);
+      }, 0);
+    });
   },
 
   _getCrossedEdge(posX, posY, element = document.documentElement, maxDistance = 10) {