D5745: recreate plasmashellsurf on exposed, destoy on hidden

[Marco Martin]

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

REVISION SUMMARY
  every time the window gets shown the wayland surfaces
  get created, when hidden, they get destroyed
  
  showevent is too early for it as they aren't there yet,
  use :Exposed instead, but only the first time when the surface
  isn't there yet

TEST PLAN
  popup applets always have correct blur in a wayland
  session

REPOSITORY
  R242 Plasma Framework (Library)

BRANCH
  phab/recreateshell

REVISION DETAIL
  https://phabricator.kde.org/D5745

AFFECTED FILES
  src/declarativeimports/core/tooltipdialog.cpp
  src/plasmaquick/dialog.cpp

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