1108643 - Moving the mouse onto the menu immediately after clicking hamburger causes scroll bar to appear

Status: RESOLVED DUPLICATE of bug 1088637

(Core :: XUL, defect)

Description

[u416532]

User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0
Build ID: 20141125180439

Steps to reproduce:

Clicked on the hamburger menu (or whatever it is called).
Quickly moved the mouse down to where the menu was about to appear.


Actual results:

The resulting menu was shorter than normal and had a scroll bar.


Expected results:

The menu should have appeared full sized without need for a scroll bar.
The menu should look exactly the same as it would if I paused a moment before moving the mouse down.

Comment 1

[Loic]

Attachment: 1108643.mp4

It happens when moving quickly the mouse pointer over the menu entries like "Paste".

Comment 2

[Loic]

Regression range:
http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=bb35d1b73634&tochange=37f08ddaea48

I guess it appeared after Bug 994117.

Comment 4

[Firefox Bug Husbandry Bot]

Moving to Core:XUL per https://bugzilla.mozilla.org/show_bug.cgi?id=1455336