D12876: [Dialog] Handle dialog being minimized gracefully

[Kai Uwe Broulik]

broulik created this revision.
broulik added a reviewer: Plasma.
Restricted Application added a project: Frameworks.
Restricted Application added a subscriber: kde-frameworks-devel.
broulik requested review of this revision.

REVISION SUMMARY
  Dialogs don't show up in task bar and also don't have window decoration so they're not meant to be minimized.
  However, they might still be minimized by external means, such as "Minimize All" plasmoid.
  In this case hide the dialog. Also, Qt restores a minimize state when showing again, rendering the dialog inaccessible. Before showing, always unset the minimized state using new Qt 5.10 API
  
  BUG: 381242

TEST PLAN
  - Opened system tray, checked the pin, Minimized All → Tray "is expanded" line disappeared
  - Opened system tray again → Dialog showed up just fine

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D12876

AFFECTED FILES
  src/plasmaquick/dialog.cpp

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