Review Request 127374: Fix taskbar flicking when opening Plasma popups

[Eike Hein]

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Ship it!




I'd say flesh out the comment a bit more to indicate this won't be needed with newer versions of Qt (so future readers don't need to do research to answer "can I delete this?"), but otherwise it's a harmless fix that helps, so +1

- Eike Hein


On March 14, 2016, 6:45 p.m., David Edmundson wrote:
> 
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> https://git.reviewboard.kde.org/r/127374/
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> 
> (Updated March 14, 2016, 6:45 p.m.)
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> 
> Review request for KDE Frameworks and Plasma.
> 
> 
> Repository: plasma-framework
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> 
> Description
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> 
> When we show a Qt window it resets all wm_states, including the
> SKIP_TASKBAR state that Qt doesn't support see
> QXcbWindow::setNetWmStates
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> In order to set the flag we need to do it after Qt has mapped the
> window. (after a showEvent)
> 
> Dialog previously did this using ExposeEvent which we know will happen after show.
> 
> However:
> 1) This is a rather random fix
> 2) It will be called after TaskManager has been notified of a new window
> 
> By merging into the same event we can make sure the flag is set before
> the task manager processes the new window. This means task manager will always skip plasma popups.
> 
> A better fix will obviously be patching Qt to not reset flags it doesn't know about 
> and then we can set this flag in the ctor. I shall try and do that for Qt 5.7.
> 
> BUG: 332024
> REVIEW:
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> Diffs
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>   src/plasmaquick/dialog.cpp 56f39c0740a1e32a9588e7461dcb45aab3fe9e85 
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> Diff: https://git.reviewboard.kde.org/r/127374/diff/
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> 
> Testing
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> Added debug in libtaskmanager, the window flags are always correct for the new window.
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> 
> Thanks,
> 
> David Edmundson
> 
>

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