D6523: check Buffer validity

[Marco Martin]

mart added a comment.


  In https://phabricator.kde.org/D6523#122107, @davidedmundson wrote:
  
  > Same question as before, what happens when we go from a theme with shadows to a theme without?
  
  
  I tried to switch back and forth several times between breeze and keramiek(the theme linked in the bug which could reproduce the crash) and all seems to be fine
  
  the shadows go from visible to absent and back and doesn't crash

REPOSITORY
  R127 KWayland

REVISION DETAIL
  https://phabricator.kde.org/D6523

To: mart, #plasma
Cc: davidedmundson, plasma-devel, #frameworks, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, eliasp, sebas, apol, mart, hein, lukas
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