Review Request: Fix KSelectionWatcher / KWindowSystem::compositingChanged signal

[Thomas Lübking]

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http://git.reviewboard.kde.org/r/107983/
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Review request for kdelibs, kwin, Aaron J. Seigo, Marco Martin, Martin Gräßlin, and Luboš Luňák.


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"
I'll also give it a try with e17 and for xfce we just hope the best? ;-)

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)

As for SubstructureNotify, well, the message is sent to the root window - but the iccm suggests to send by StructureNotify mask (http://tronche.com/gui/x/icccm/sec-2.html) bottom of the page. I just gave it a wild shot ("hey, what if we tell everyone") and it absolutely reproducibly enables notification of selectionwatcher constructed before the eventloop is up (while it also very much seems to be not required once the eventloop is actually up) and i don't think it should hurt at all (but might hint a problem in rather the selectionwatcher, since we cannot expect others to send by that mask)


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


Diffs
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  kdeui/util/kmanagerselection.cpp a289f47 
  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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