Review Request 121936: Fix KScreen effect availability check

[Kai Uwe Broulik]

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https://git.reviewboard.kde.org/r/121936/
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Review request for Plasma and Martin Gräßlin.


Repository: powerdevil


Description
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Before starting the effect check whether it is available. I had to tweak that check a bit, apparently it was not enough just getting the atom (it would return something sensible each time) but I also need to check for whether it's available on the root window.

This patch is merely to fix the inability to suspend in the non-compositing/effect disabled case. Eventually I want to be able to use a new KWindowEffects::isEffectAvailable(KScreenHelperEffect) instead but unfortunately I wasn't aware of this method until now and so we need to fix it here until we can use the new frameworks version which is due after the 5.2 release.

The effect is changed so it emits fadedOut() when it did not start because it was unsupported. This way a user can just start the effect and have the signal fired nonetheless without any additional codepaths and checks outside of the effect.


Diffs
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  daemon/actions/bundled/suspendsession.cpp 9663016 
  daemon/kwinkscreenhelpereffect.h cb60b5f 
  daemon/kwinkscreenhelpereffect.cpp 89652e6 

Diff: https://git.reviewboard.kde.org/r/121936/diff/


Testing
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Suspending in both compositing and non-compositing cases works now.


Thanks,

Kai Uwe Broulik

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