1 files changed, 39 insertions, 0 deletions
diff --git a/browser/components/extensions/test/browser/browser_ext_browserAction_popup_resize_bottom.js b/browser/components/extensions/test/browser/browser_ext_browserAction_popup_resize_bottom.js
new file mode 100644
index 0000000000..3370be0053
--- /dev/null
+++ b/browser/components/extensions/test/browser/browser_ext_browserAction_popup_resize_bottom.js
@@ -0,0 +1,39 @@
+/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set sts=2 sw=2 et tw=80: */
+"use strict";
+
+loadTestSubscript("head_browserAction.js");
+
+// Test that we still make reasonable maximum size calculations when the window
+// is close enough to the bottom of the screen that the menu panel opens above,
+// rather than below, its button.
+add_task(async function testBrowserActionMenuResizeBottomArrow() {
+  const WIDTH = 800;
+  const HEIGHT = 80;
+
+  let left = screen.availLeft + screen.availWidth - WIDTH;
+  let top = screen.availTop + screen.availHeight - HEIGHT;
+
+  let win = await BrowserTestUtils.openNewBrowserWindow();
+
+  win.resizeTo(WIDTH, HEIGHT);
+
+  // Sometimes we run into problems on Linux with resizing being asynchronous
+  // and window managers not allowing us to move the window so that any part of
+  // it is off-screen, so we need to try more than once.
+  for (let i = 0; i < 20; i++) {
+    win.moveTo(left, top);
+
+    if (win.screenX == left && win.screenY == top) {
+      break;
+    }
+
+    await delay(100);
+  }
+
+  await SimpleTest.promiseFocus(win);
+
+  await testPopupSize(true, win, "bottom");
+
+  await BrowserTestUtils.closeWindow(win);
+});