D4989: more aggressively repaint when the shadow changes

[Marco Martin]

mart added inline comments.

INLINE COMMENTS

> anthonyfieroni wrote in toplevel.cpp:337
> About me, rectangle should not be translated to pos, cause it does not contain shadow (who stays not updated)

shadow()->shadowRegion().boundingRect() is a rectangle always in relative coorninates from the shadow, ie , always at 0,0
so it needs to be repositioned to where it actually is in the screen

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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