fix: Fixed zen-empty-tab movement while inserting items into a group (#9948)

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 d80a66a01002e78a9c65545d08fe786328ddf124..50f4d52090139256b00c7183fe61e6f411960db1 100644
+index d80a66a01002e78a9c65545d08fe786328ddf124..749991884735a1a6d7b1a2c2e1c77f7eae2e5c28 100644
 --- a/browser/components/tabbrowser/content/tabbrowser.js
 +++ b/browser/components/tabbrowser/content/tabbrowser.js
 @@ -422,15 +422,60 @@
@@ -673,7 +673,7 @@ index d80a66a01002e78a9c65545d08fe786328ddf124..50f4d52090139256b00c7183fe61e6f4
          moveBefore = false;
        } else if (!element.pinned && targetElement && targetElement.pinned) {
          // If the caller asks to move an unpinned element next to a pinned
-@@ -6165,14 +6303,29 @@
+@@ -6165,14 +6303,34 @@
          //    move the tab group right before the first unpinned tab.
          // 4. Moving a tab group and the first unpinned tab is grouped:
          //    move the tab group right before the first unpinned tab's tab group.
@@ -692,11 +692,16 @@ index d80a66a01002e78a9c65545d08fe786328ddf124..50f4d52090139256b00c7183fe61e6f4
 +      if (targetElement?.group?.hasAttribute("split-view-group")) {
 +        targetElement = targetElement.group;
 +      }
++      if (targetElement?.hasAttribute("zen-empty-tab")) {
 +        // When the folder is the last element in the pinned section,
 +        // targetElement is a tab with the zen-empty-tab attribute.
 +        // If the movement is from top to bottom, it must be redefined as a folder.
-+      if (targetElement?.hasAttribute("zen-empty-tab") && !moveBefore) {
++        if (!moveBefore) {
 +          targetElement = targetElement.group;
++        } else {
++          // Always insert an element after zen-empty-tab to avoid it moving from the first position
++          moveBefore = false;
++        }
 +      }
  
        let getContainer = () =>
@@ -704,7 +709,7 @@ index d80a66a01002e78a9c65545d08fe786328ddf124..50f4d52090139256b00c7183fe61e6f4
          element.pinned
            ? this.tabContainer.pinnedTabsContainer
            : this.tabContainer;
-@@ -6181,7 +6334,7 @@
+@@ -6181,7 +6339,7 @@
          element,
          () => {
            if (moveBefore) {
@@ -713,7 +718,7 @@ index d80a66a01002e78a9c65545d08fe786328ddf124..50f4d52090139256b00c7183fe61e6f4
            } else if (targetElement) {
              targetElement.after(element);
            } else {
-@@ -6230,7 +6383,7 @@
+@@ -6230,7 +6388,7 @@
        if (!this.isTab(aTab)) {
          throw new Error("Can only move a tab into a tab group");
        }
@@ -722,7 +727,7 @@ index d80a66a01002e78a9c65545d08fe786328ddf124..50f4d52090139256b00c7183fe61e6f4
          return;
        }
        if (aTab.group && aTab.group.id === aGroup.id) {
-@@ -6324,6 +6477,10 @@
+@@ -6324,6 +6482,10 @@
  
        moveActionCallback();
  
@@ -733,7 +738,7 @@ index d80a66a01002e78a9c65545d08fe786328ddf124..50f4d52090139256b00c7183fe61e6f4
        // Clear tabs cache after moving nodes because the order of tabs may have
        // changed.
        this.tabContainer._invalidateCachedTabs();
-@@ -7221,7 +7378,7 @@
+@@ -7221,7 +7383,7 @@
              // preventDefault(). It will still raise the window if appropriate.
              break;
            }
@@ -742,7 +747,7 @@ index d80a66a01002e78a9c65545d08fe786328ddf124..50f4d52090139256b00c7183fe61e6f4
            window.focus();
            aEvent.preventDefault();
            break;
-@@ -8166,6 +8323,7 @@
+@@ -8166,6 +8328,7 @@
              aWebProgress.isTopLevel
            ) {
              this.mTab.setAttribute("busy", "true");
@@ -750,7 +755,7 @@ index d80a66a01002e78a9c65545d08fe786328ddf124..50f4d52090139256b00c7183fe61e6f4
              gBrowser._tabAttrModified(this.mTab, ["busy"]);
              this.mTab._notselectedsinceload = !this.mTab.selected;
            }
-@@ -9157,7 +9315,7 @@ var TabContextMenu = {
+@@ -9157,7 +9320,7 @@ var TabContextMenu = {
      );
      contextUnpinSelectedTabs.hidden =
        !this.contextTab.pinned || !this.multiselected;
@@ -759,7 +764,7 @@ index d80a66a01002e78a9c65545d08fe786328ddf124..50f4d52090139256b00c7183fe61e6f4
      // Build Ask Chat items
      TabContextMenu.GenAI.buildTabMenu(
        document.getElementById("context_askChat"),
-@@ -9476,6 +9634,7 @@ var TabContextMenu = {
+@@ -9476,6 +9639,7 @@ var TabContextMenu = {
          )
        );
      } else {

src/zen/folders/ZenFolders.mjs

@@ -1346,18 +1346,20 @@
             switch (stateData?.prevSiblingInfo?.type) {
               case 'group': {
                 const folder = document.getElementById(stateData.prevSiblingInfo.id);
-                gBrowser.moveTabAfter(node, folder);
+                folder.after(node);
                 break;
               }
               case 'tab': {
                 const tab = parentWorkingData.node.querySelector(
                   `[zen-pin-id="${stateData.prevSiblingInfo.id}"]`
                 );
-                gBrowser.moveTabAfter(node, tab);
+                tab.after(node);
                 break;
               }
               default: {
-                const start = parentWorkingData.node.querySelector('.zen-tab-group-start');
+                // Should insert after zen-empty-tab
+                const start =
+                  parentWorkingData.node.querySelector('.zen-tab-group-start').nextElementSibling;
                 start.after(node);
               }
             }