Review Request 107983: Fix KWindowSystem::compositingChanged signal

[Ralf Jung]

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The plasma bug about not noticing composite changes is hitting me regularly, now that I make use the suspend-compositing-window-hint feature. It's quite annoying as I often have to restart plamsa and toggle compositing two or three times until it finally gets things right again. This patch fixes the issue fine for me.

Would it be possible for some core kdelibs developer to have a look at this, so that this 4-year-old bug can finally be resolved? It'd be a shame if KDE 4.11 would ship without this patch.

- Ralf Jung


On March 23, 2013, 9:06 p.m., Thomas Lübking wrote:
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> This is an automatically generated e-mail. To reply, visit:
> http://git.reviewboard.kde.org/r/107983/
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> (Updated March 23, 2013, 9:06 p.m.)
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> 
> Review request for kdelibs, kwin, Plasma, Aaron J. Seigo, Fredrik Höglund, Martin Gräßlin, and Marco Martin.
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> 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.
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> 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)
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> 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.
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> 
> This addresses bug 179042.
>     http://bugs.kde.org/show_bug.cgi?id=179042
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> 
> Diffs
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>   kdeui/windowmanagement/kwindowsystem_x11.cpp f9b3cc1 
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> Diff: http://git.reviewboard.kde.org/r/107983/diff/
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> Testing
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> see summary
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> File Attachments
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> testcase
>   http://git.reviewboard.kde.org/media/uploaded/files/2013/01/04/selectionwatcher.cpp
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> 
> Thanks,
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> Thomas Lübking
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>

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