It's caused by the lack of "EWMH source indication" support of gtk.
EWMH source indication is a feature used to prevent from keyboard
focus stealing.
While the user is doing keyboard or mouse input, requests by other
applications to raise a window to front could optionally be ignored by
WM. So the work the user is doing won't be disturbed. That's the
origin of the bug.
I added source indication and ask the WM explicitly to move the dialog to front.
Hence it's fixed. Quite interesting. :-)
Too bad that gtk+ API does not provide this functionality.

On Tue, Jun 12, 2012 at 5:17 PM, Christoph Wickert
<[email protected]> wrote:
> Am Dienstag, den 12.06.2012, 16:50 +0800 schrieb PCMan:
>> It's here, in lxpanel:
>> http://lxde.git.sourceforge.net/git/gitweb.cgi?p=lxde/lxpanel;a=commitdiff;h=37f5734a37857ac682fcb7313d3b9554be388e51;hp=71f5bda275e9dbf164e8a6425630fac69f87999f
>
> The bug is about the "Run" dialog not getting focused when the user
> presses CTRL+F2. Keyboard shortcuts are handled by Openbox, so I wonder
> how a change in lxpanel will fix the focus issue?!
>
> I was thinking of something along the lines of
>
>        <application name="lxpanel" class="Lxpanel">
>              <focus>yes</focus>
>        </application>
>
> in Openbox's lxde-rc.xml and that's why I looked at the lxde-common
> package.
>
> Kind regards,
> Christoph
>
>
>
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