D8851: Set enable_blur_behind hint on demand.

[David Edmundson]

davidedmundson created this revision.
Restricted Application added a project: Frameworks.
Restricted Application added a subscriber: Frameworks.

REVISION SUMMARY
  Creating a window handle is relatively slow. We don't want it in the
  constructor if we don't need it.
  
  Replaces https://phabricator.kde.org/D8845

TEST PLAN
  Opened on X and Wayland. Looked the same as before.
  (which to me isn't very blurry, but a regular grey?)

REPOSITORY
  R236 KWidgetsAddons

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D8851

AFFECTED FILES
  src/ktooltipwidget.cpp

To: davidedmundson
Cc: #frameworks
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