Refactor tab handling in ZenGlanceManager and update tab filtering logic for improved performance

src/browser/base/zen-components/ZenGlanceManager.mjs

@@ -245,7 +245,8 @@
       this.overlay.style.pointerEvents = 'none';
       this.quickCloseGlance({ justAnimateParent: true, clearID: false });
       const originalPosition = this.#glances.get(this.#currentGlanceID).originalPosition;
-      gZenUIManager.motion.animate(
+      gZenUIManager.motion
+        .animate(
           this.#currentParentTab.linkedBrowser.closest('.browserSidebarContainer'),
           {
             scale: [0.98, 1],
@@ -257,7 +258,8 @@
             type: 'spring',
             bounce: 0.2,
           }
-      ).then(() => {
+        )
+        .then(() => {
           this.#currentParentTab.linkedBrowser.closest('.browserSidebarContainer').removeAttribute('style');
         });
       gZenUIManager.motion

src/browser/components/tabbrowser/content/tabbrowser-js.patch

@@ -1,5 +1,5 @@
 diff --git a/browser/components/tabbrowser/content/tabbrowser.js b/browser/components/tabbrowser/content/tabbrowser.js
-index ff90a70bdad6c94ec4b90027ff102972d0eb28e5..8063e0149827bb3da06b25079efa2a5a6fdfbb3a 100644
+index ff90a70bdad6c94ec4b90027ff102972d0eb28e5..cca93dc8fe6300a5bee22029bbe2369e9240ba35 100644
 --- a/browser/components/tabbrowser/content/tabbrowser.js
 +++ b/browser/components/tabbrowser/content/tabbrowser.js
 @@ -406,11 +406,39 @@
@@ -196,6 +196,15 @@ index ff90a70bdad6c94ec4b90027ff102972d0eb28e5..8063e0149827bb3da06b25079efa2a5a
          if (
            !bulkOrderedOpen &&
            ((openerTab &&
+@@ -3780,7 +3859,7 @@
+       }
+ 
+       /** @type {MozTabbrowserTab|undefined} */
+-      let tabAfter = this.tabs.at(index);
++      let tabAfter = this.tabs.filter(tab => !tab.hasAttribute("zen-glance-tab")).at(index);
+       this.tabContainer._invalidateCachedTabs();
+ 
+       if (tabGroup) {
 @@ -4095,6 +4174,9 @@
          return;
        }