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http://git.reviewboard.kde.org/r/107983/
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(Updated Jan. 5, 2013, 5:08 p.m.)


Review request for kdelibs, kwin, Plasma, Aaron J. Seigo, Marco Martin, Martin 
Gräßlin, and Fredrik Höglund.


Changes
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Modified patch to check the root event but let it unconditionally pass to Qt 
(to preserve other SelectionOwner notifications)
This does also stop additional notifications on winId(), so my guess is that 
passing the root event simply causes something (Qt?!) to "steal" it from XFixes.

Remaining question is, whether the explicit XFixesSelectSelectionInput call is 
still required (or we do receive them anyway due to eg. Qt's cnp implementation 
- from the simple testcase the answer is "yes")


Summary (updated)
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Fix KWindowSystem::compositingChanged signal


Description
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It works fine here (tested so far KWindowSystem signal, KSelectionWatcher only 
with kwin) with kwin (shift+alt+f12), xcompmgr, compiz & "metacity -c" and e17.
Didn't try xfce nor mutter.

Technically:
I do not at all understand why KWindowSystem is *not* watching the root window 
- KSelectionOwner for one is sending events to the root and this also seems the 
case for all other WMs (at least everything now starts to cause the signal to 
be emitted)

The KSelectionWatcher failure seems to be kwin specific (wrote me a cleaner 
testcase), there'll be some X11 event processing on top that eats away the 
client messages.
So this one can be scratched from the patch, the KWindowSystem issue remains.


This addresses bug 179042.
    http://bugs.kde.org/show_bug.cgi?id=179042


Diffs (updated)
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  kdeui/windowmanagement/kwindowsystem_x11.cpp f9b3cc1 

Diff: http://git.reviewboard.kde.org/r/107983/diff/


Testing
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see summary


Thanks,

Thomas Lübking

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