D4989: more aggressively repaint when the shadow changes

[Marco Martin]

mart added inline comments.

INLINE COMMENTS

> graesslin wrote in toplevel.cpp:325
> We do have the repaints already. Check the dirtyRect and the following addLayerRepaint.
> 
> Instead of adding a new call lets fix it.

isn't dirtyrect only the new decoration geometry, while oldvisiblerect the old before the geometry change?

or is dirtyrect supposed to be an union of old and new geometries?

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D4989

To: mart, #plasma, graesslin
Cc: anthonyfieroni, plasma-devel, kwin, #kwin, progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol
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