[Differential] [Request, 57 lines] D2622: Support compose key in xkbcommon integration

[graesslin (Martin Gräßlin)]

graesslin created this revision.
graesslin added reviewers: KWin, Plasma on Wayland.
Restricted Application added subscribers: kwin, plasma-devel.
Restricted Application added projects: Plasma on Wayland, KWin.

REVISION SUMMARY
  The Xkb class now creates a compose key table and a state object and
  feeds all key presses through the compose state machine.
  
  Xkb now tracks the latest keysym which is provided through new method
  currentKeysym. This is now used when creating a QKeyEvent instead of
  passing the key code to the xkb state. With that the keysym can also
  be updated through the compose state system.
  
  This only affects KWin internal usage where text is composed, e.g. the
  present windows effect filter. Wayland clients do not gain compose key
  support, though.
  
  Minimum xkbcommon version raised to 0.5 as compose key support is new
  in that version.

TEST PLAN
  Enabled compose key support in keymap and verified through DebugConsole

REPOSITORY
  rKWIN KWin

BRANCH
  compose-key-support

REVISION DETAIL
  https://phabricator.kde.org/D2622

AFFECTED FILES
  CMakeLists.txt
  keyboard_input.cpp
  keyboard_input.h

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

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