1 files changed, 74 insertions, 0 deletions
diff --git a/browser/components/customizableui/test/browser_890262_destroyWidget_after_add_to_panel.js b/browser/components/customizableui/test/browser_890262_destroyWidget_after_add_to_panel.js
new file mode 100644
index 0000000000..61e354dd61
--- /dev/null
+++ b/browser/components/customizableui/test/browser_890262_destroyWidget_after_add_to_panel.js
@@ -0,0 +1,74 @@
+/* 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 kLazyAreaId = "test-890262-lazy-area";
+const kWidget1Id = "test-890262-widget1";
+const kWidget2Id = "test-890262-widget2";
+
+setupArea();
+
+// Destroying a widget after defaulting it to a lazy area should work.
+add_task(function () {
+  CustomizableUI.createWidget({
+    id: kWidget1Id,
+    removable: true,
+    defaultArea: kLazyAreaId,
+  });
+  let noError = true;
+  try {
+    CustomizableUI.destroyWidget(kWidget1Id);
+  } catch (ex) {
+    console.error(ex);
+    noError = false;
+  }
+  ok(
+    noError,
+    "Shouldn't throw an exception for a widget that was created in a not-yet-constructed area"
+  );
+});
+
+// Destroying a widget after moving it to a lazy area should work.
+add_task(function () {
+  CustomizableUI.createWidget({
+    id: kWidget2Id,
+    removable: true,
+    defaultArea: CustomizableUI.AREA_NAVBAR,
+  });
+
+  CustomizableUI.addWidgetToArea(kWidget2Id, kLazyAreaId);
+  let noError = true;
+  try {
+    CustomizableUI.destroyWidget(kWidget2Id);
+  } catch (ex) {
+    console.error(ex);
+    noError = false;
+  }
+  ok(
+    noError,
+    "Shouldn't throw an exception for a widget that was added to a not-yet-constructed area"
+  );
+});
+
+add_task(async function asyncCleanup() {
+  let lazyArea = document.getElementById(kLazyAreaId);
+  if (lazyArea) {
+    lazyArea.remove();
+  }
+  try {
+    CustomizableUI.unregisterArea(kLazyAreaId);
+  } catch (ex) {} // If we didn't register successfully for some reason
+  await resetCustomization();
+});
+
+function setupArea() {
+  let lazyArea = document.createXULElement("hbox");
+  lazyArea.id = kLazyAreaId;
+  document.getElementById("nav-bar").appendChild(lazyArea);
+  CustomizableUI.registerArea(kLazyAreaId, {
+    type: CustomizableUI.TYPE_TOOLBAR,
+    defaultPlacements: [],
+  });
+}