[Differential] [Updated] D4135: Split implementation of keyboard layout handling into a dedicated class

[Martin Gräßlin]

graesslin added a dependency: D4128: Use an InputEventSpy to notify about key 
and modifier state changes.

REVISION DETAIL
  https://phabricator.kde.org/D4135

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