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[Bug 872207] Re: When Firefox is running in Unity, drop-down menus sometime close when opened


For me, the bug appears at random (firefox 9, oneiric).  Any menus only
stay open until I move the mouse; switching to another window and back
generally seems to stop it.  I have noticed a couple of other things
that might be relevant, though.

Firstly, I use firefox's autoscroll feature
(preferences->advanced->browsing).  Normally, when I middle click, the
autoscroll icon appears, then doesn't disappear until I click again, but
whenever the menu bug occurs, the autoscroll icon disappears (and
autoscrolling stops) if I point at the autoscroll icon.  As far as I can
see, the two issues always happen together.

Secondly, when I open a new window using tkinter in a python
application, any open firefox and thunderbird menus close - menus in
other applications I have tried are unaffected.

For example, the following python 3.x code (replace tkinter with Tkinter
for python 2.x) simply opens a window, waits a second, closes the
window, waits a second, and repeats.  Every time the window opens, open
firefox and thunderbird menus close, regardless of whether this bug is
in effect.

from tkinter import Tk
from time import sleep
while True:
    tk.after(1000, tk.destroy)

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  When Firefox is running in Unity, drop-down menus sometime close when

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