1 files changed, 58 insertions, 0 deletions
diff --git a/browser/components/customizableui/test/browser_886323_buildArea_removable_nodes.js b/browser/components/customizableui/test/browser_886323_buildArea_removable_nodes.js
new file mode 100644
index 0000000000..99968a8266
--- /dev/null
+++ b/browser/components/customizableui/test/browser_886323_buildArea_removable_nodes.js
@@ -0,0 +1,58 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const kButtonId = "test-886323-removable-moved-node";
+const kLazyAreaId = "test-886323-lazy-area-for-removability-testing";
+
+var gNavBar = document.getElementById(CustomizableUI.AREA_NAVBAR);
+var gLazyArea;
+
+// Removable nodes shouldn't be moved by buildArea
+add_task(async function () {
+  let dummyBtn = createDummyXULButton(kButtonId, "Dummy");
+  dummyBtn.setAttribute("removable", "true");
+  CustomizableUI.getCustomizationTarget(gNavBar).appendChild(dummyBtn);
+  let popupSet = document.getElementById("mainPopupSet");
+  gLazyArea = document.createXULElement("panel");
+  gLazyArea.id = kLazyAreaId;
+  gLazyArea.hidden = true;
+  popupSet.appendChild(gLazyArea);
+  CustomizableUI.registerArea(kLazyAreaId, {
+    type: CustomizableUI.TYPE_PANEL,
+    defaultPlacements: [],
+  });
+  CustomizableUI.addWidgetToArea(kButtonId, kLazyAreaId);
+  assertAreaPlacements(
+    kLazyAreaId,
+    [kButtonId],
+    "Placements should have changed because widget is removable."
+  );
+  let btn = document.getElementById(kButtonId);
+  btn.setAttribute("removable", "false");
+  gLazyArea._customizationTarget = gLazyArea;
+  CustomizableUI.registerToolbarNode(gLazyArea, []);
+  assertAreaPlacements(
+    kLazyAreaId,
+    [],
+    "Placements should no longer include widget."
+  );
+  is(
+    btn.parentNode.id,
+    CustomizableUI.getCustomizationTarget(gNavBar).id,
+    "Button shouldn't actually have moved as it's not removable"
+  );
+  btn = document.getElementById(kButtonId);
+  if (btn) {
+    btn.remove();
+  }
+  CustomizableUI.removeWidgetFromArea(kButtonId);
+  CustomizableUI.unregisterArea(kLazyAreaId);
+  gLazyArea.remove();
+});
+
+add_task(async function asyncCleanup() {
+  await resetCustomization();
+});