From df159bed3efc6c0bc17ab8d767857be6a55bbec6 Mon Sep 17 00:00:00 2001
From: Tooru Fujisawa <arai_a@mac.com>
Date: Sat, 20 Jan 2018 20:40:10 +0900
Subject: [PATCH] Bug 1430408 - Part 2: Wait for the next event tick after
 transitionend event to make sure the all event handlers finish in
 devtools/client/debugger/test/mochitest/browser_dbg_instruments-pane-collapse_keyboard.js
 r=pbro

---
 .../browser_dbg_instruments-pane-collapse_keyboard.js         | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/devtools/client/debugger/test/mochitest/browser_dbg_instruments-pane-collapse_keyboard.js b/devtools/client/debugger/test/mochitest/browser_dbg_instruments-pane-collapse_keyboard.js
index 600e2814f1b1..4e77ff57ac65 100644
--- a/devtools/client/debugger/test/mochitest/browser_dbg_instruments-pane-collapse_keyboard.js
+++ b/devtools/client/debugger/test/mochitest/browser_dbg_instruments-pane-collapse_keyboard.js
@@ -35,4 +35,8 @@ async function togglePane(button, message, pane, keycode) {
   button.focus();
   EventUtils.synthesizeKey(keycode, {});
   await onTransitionEnd;
+
+  // Wait for the next event tick to make sure all transitionend event
+  // handlers finish.
+  await waitForTick();
 }