D8163: Move StatusNotifierItem for VirtualKeyboard into a helper process

[Martin Flöser]

graesslin created this revision.
graesslin added reviewers: KWin, Plasma, mart.
Restricted Application added a project: KWin.
Restricted Application added subscribers: kwin, plasma-devel.

REVISION SUMMARY
  During startup the StatusNotifierItem can cause a freeze as it might do
  a blocking DBus call while the other side is performing a Wayland
  roundtrip. This freeze is broken when the DBus call times out but then
  the SNI doesn't work either.
  
  By moving the SNI into a dedicated helper process KWin itself does not
  have any blocking calls to DBus. In addition KWin exposes a DBus API to
  enable/disable the virtual keyboard, so that other processes can also
  make use of it to provide e.g. a better UI (e.g. Plasmoid).
  
  BUG: 385371

TEST PLAN
  Started a new session, it did not freeze and I had a SNI which
  worked as expected

REPOSITORY
  R108 KWin

BRANCH
  virt-keyboard-sni

REVISION DETAIL
  https://phabricator.kde.org/D8163

AFFECTED FILES
  CMakeLists.txt
  autotests/CMakeLists.txt
  autotests/test_virtualkeyboard_dbus.cpp
  config-kwin.h.cmake
  helpers/CMakeLists.txt
  helpers/virtualkeyboard/CMakeLists.txt
  helpers/virtualkeyboard/main.cpp
  helpers/virtualkeyboard/sni.cpp
  helpers/virtualkeyboard/sni.h
  virtualkeyboard.cpp
  virtualkeyboard.h
  virtualkeyboard_dbus.cpp
  virtualkeyboard_dbus.h

To: graesslin, #kwin, #plasma, mart
Cc: plasma-devel, kwin, bwowk, ZrenBot, progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart
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