From f40a7aaee1cb0f409f1f142be1f3a4de897069f7 Mon Sep 17 00:00:00 2001
From: "mr. m" <91018726+mr-cheffy@users.noreply.github.com>
Date: Tue, 31 Mar 2026 14:46:32 +0200
Subject: [PATCH] gh-13016: Fixed pinned tabs not being able to collapse
 (gh-13018)

---
 .../tabbrowser/content/tabgroup-js.patch      | 24 ++++++++++++-------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/src/browser/components/tabbrowser/content/tabgroup-js.patch b/src/browser/components/tabbrowser/content/tabgroup-js.patch
index 4517ac261..e1803b91f 100644
--- a/src/browser/components/tabbrowser/content/tabgroup-js.patch
+++ b/src/browser/components/tabbrowser/content/tabgroup-js.patch
@@ -1,5 +1,5 @@
 diff --git a/browser/components/tabbrowser/content/tabgroup.js b/browser/components/tabbrowser/content/tabgroup.js
-index 3ca119e8dc72fac652c98505211864483d98add2..026b524be51170882e788a701095b938d6923f3e 100644
+index 3ca119e8dc72fac652c98505211864483d98add2..b65307ee8df896488a4c51e3a25bf9ad9e1c8179 100644
 --- a/browser/components/tabbrowser/content/tabgroup.js
 +++ b/browser/components/tabbrowser/content/tabgroup.js
 @@ -14,11 +14,11 @@
@@ -101,7 +101,13 @@ index 3ca119e8dc72fac652c98505211864483d98add2..026b524be51170882e788a701095b938
  
      resetDefaultGroupName = () => {
        this.#defaultGroupName = "";
-@@ -178,7 +201,9 @@
+@@ -175,10 +198,15 @@
+       if (!this.#tabChangeObserver) {
+         this.#tabChangeObserver = new window.MutationObserver(mutations => {
+           if (!this.tabs.length) {
++            if (this.tagName === "zen-workspace-collapsible-pins") {
++              return;
++            }
              this.dispatchEvent(
                new CustomEvent("TabGroupRemoved", { bubbles: true })
              );
@@ -111,7 +117,7 @@ index 3ca119e8dc72fac652c98505211864483d98add2..026b524be51170882e788a701095b938
              Services.obs.notifyObservers(
                this,
                "browser-tabgroup-removed-from-dom"
-@@ -223,7 +248,10 @@
+@@ -223,7 +251,10 @@
            }
          });
        }
@@ -123,7 +129,7 @@ index 3ca119e8dc72fac652c98505211864483d98add2..026b524be51170882e788a701095b938
      }
  
      get color() {
-@@ -317,6 +345,9 @@
+@@ -317,6 +348,9 @@
      }
  
      set collapsed(val) {
@@ -133,7 +139,7 @@ index 3ca119e8dc72fac652c98505211864483d98add2..026b524be51170882e788a701095b938
        if (!!val == this.collapsed) {
          return;
        }
-@@ -403,7 +434,6 @@
+@@ -403,7 +437,6 @@
            tabGroupName,
          })
          .then(result => {
@@ -141,7 +147,7 @@ index 3ca119e8dc72fac652c98505211864483d98add2..026b524be51170882e788a701095b938
          });
      }
  
-@@ -478,13 +508,65 @@
+@@ -478,13 +511,65 @@
       * @returns {MozTabbrowserTab[]}
       */
      get tabs() {
@@ -212,7 +218,7 @@ index 3ca119e8dc72fac652c98505211864483d98add2..026b524be51170882e788a701095b938
      }
  
      /**
-@@ -592,7 +674,6 @@
+@@ -592,7 +677,6 @@
            );
          } else {
            if (tabOrSplitView.pinned) {
@@ -220,7 +226,7 @@ index 3ca119e8dc72fac652c98505211864483d98add2..026b524be51170882e788a701095b938
            }
            let tabToMove =
              this.ownerGlobal === tabOrSplitView.ownerGlobal
-@@ -661,7 +742,7 @@
+@@ -661,7 +745,7 @@
       */
      on_click(event) {
        let isToggleElement =
@@ -229,7 +235,7 @@ index 3ca119e8dc72fac652c98505211864483d98add2..026b524be51170882e788a701095b938
          event.target === this.#overflowCountLabel;
        if (isToggleElement && event.button === 0) {
          event.preventDefault();
-@@ -740,5 +821,6 @@
+@@ -740,5 +824,6 @@
      }
    }