Bug 1702125 - Only automatically add/remove open state on buttons on anchored arrowpanel events. r=Gijs

Differential Revision: https://phabricator.services.mozilla.com/D110812

toolkit/content/widgets/panel.js

@@ -202,13 +202,13 @@
       if (this.isArrowPanel && event.target == this) {
         this.removeAttribute("animating");
         this.setAttribute("panelopen", "true");
-      }
 
-      if (this.isAnchored && this.anchorNode) {
-        let anchorRoot =
-          this.anchorNode.closest("toolbarbutton, .anchor-root") ||
-          this.anchorNode;
-        anchorRoot.setAttribute("open", "true");
+        if (this.isAnchored && this.anchorNode) {
+          let anchorRoot =
+            this.anchorNode.closest("toolbarbutton, .anchor-root") ||
+            this.anchorNode;
+          anchorRoot.setAttribute("open", "true");
+        }
       }
 
       // Fire event for accessibility APIs
@@ -229,13 +229,13 @@
         } else if (animate) {
           this.setAttribute("animate", "cancel");
         }
-      }
 
-      if (this.isAnchored && this.anchorNode) {
-        let anchorRoot =
-          this.anchorNode.closest("toolbarbutton, .anchor-root") ||
-          this.anchorNode;
-        anchorRoot.removeAttribute("open");
+        if (this.isAnchored && this.anchorNode) {
+          let anchorRoot =
+            this.anchorNode.closest("toolbarbutton, .anchor-root") ||
+            this.anchorNode;
+          anchorRoot.removeAttribute("open");
+        }
       }
 
       try {