D26000: [Plasma Dialog] Use QXcbWindowFunctions for setting window types Qt WindowFlags don't knows

[Kai Uwe Broulik]

broulik created this revision.
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REVISION SUMMARY
  ... but Qt XCB knows, such as Notifications type.
  This ensures QXcbWindow keeps the correct window types around.
  Only for types that aren't in NET WM like OSD and Critical Notifications will it have to fall back to `KWindowSystem`.
  It also just uses it directly on Wayland.

TEST PLAN
  - OSD and notifications still work
  - Window type no longer changes when changing messing with window flags on a notification window, obsoleting D25832 <https://phabricator.kde.org/D25832>

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D26000

AFFECTED FILES
  src/plasmaquick/dialog.cpp

To: broulik, #plasma
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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