D9223: [Plasma Dialog] Call window effects only if visible

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, graesslin.
Restricted Application added projects: Plasma, Frameworks.
Restricted Application added subscribers: Frameworks, plasma-devel.

REVISION SUMMARY
  It spends 160ms in total on plasmashell startup for me here.

TEST PLAN
  My plasma popups are still properly blurred both on X and Wayland
  
  The `updateTheme()` method is called wayyyyy to often, however. Didn't check whether it was generating the mask or the X calls (probably both) is what makes it slow.

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D9223

AFFECTED FILES
  src/plasmaquick/dialog.cpp

To: broulik, #plasma, graesslin
Cc: plasma-devel, #frameworks, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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