[Differential] [Request, 230 lines] D3049: Support passing generic QIcon through PlasmaWindow interface

[graesslin (Martin Gräßlin)]

graesslin created this revision.
graesslin added reviewers: Plasma on Wayland, hein.
Restricted Application added a subscriber: plasma-devel.
Restricted Application added a project: Plasma on Wayland.

REVISION SUMMARY
  Especially for Xwayland windows the compositor might not have a themed
  icon name. Resulting in a task manager not having dedicated icons for
  Xwayland windows.
  
  This change deprecates the way how a compositor is supposed to set the
  window icon. Instead of passing the themed icon name, it is now supposed to
  pass the QIcon. In case it's a themed icon the existing way to pass to
  the client is used.
  
  Otherwise a new event is used to inform the client that there is an icon
  
  - no data is transmitted at this point. The client can then create a
  
  file descriptor and pass it to the compositor. The compositor serializes
  the icon into the file descriptor and the client can read from it. This
  all happens transparently on client side there is no api change at all.
  
  The writing and reading of the icon is done in a thread. Due to that
  Qt5::Concurrent is now a required dependency instead of an optional
  dependency.

REPOSITORY
  rKWAYLAND KWayland

BRANCH
  plasma-window-icon

REVISION DETAIL
  https://phabricator.kde.org/D3049

AFFECTED FILES
  CMakeLists.txt
  autotests/client/test_wayland_windowmanagement.cpp
  src/client/CMakeLists.txt
  src/client/plasmawindowmanagement.cpp
  src/client/protocols/plasma-window-management.xml
  src/client/registry.cpp
  src/server/CMakeLists.txt
  src/server/plasmawindowmanagement_interface.cpp
  src/server/plasmawindowmanagement_interface.h
  src/tools/CMakeLists.txt
  tests/CMakeLists.txt

EMAIL PREFERENCES
  https://phabricator.kde.org/settings/panel/emailpreferences/

To: graesslin, #plasma_on_wayland, hein
Cc: plasma-devel, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas
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