D13541: Port solid from Qt5::Widgets to Qt5::Gui

[Martin Flöser]

graesslin created this revision.
graesslin added a reviewer: Frameworks.
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REVISION SUMMARY
  The only usage of widgets was to get the active window. Incorrectly this
  was done through QWidget which would fail for any application using just
  QtGui (e.g. QtQuick).
  
  As QGuiApplication also provides access to the focus window we can use
  QtGui API instead. As a note: the whole thing is X11 specific as a
  window ID is passed to another process, which cannot work on Wayland.
  It's possible to get it work on Wayland, but that would require:
  
  - changes to the dbus protocol
  - add a dependency to KWayland
  - or extend QtWayland to generate the required code

TEST PLAN
  Compiles

REPOSITORY
  R245 Solid

BRANCH
  gui-instead-of-widgets

REVISION DETAIL
  https://phabricator.kde.org/D13541

AFFECTED FILES
  CMakeLists.txt
  src/solid/CMakeLists.txt
  src/solid/devices/backends/udisks2/udisksstorageaccess.cpp

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