D16434: Fix keyboard layout change notifications

[Fabian Vogt]

fvogt created this revision.
fvogt added reviewers: Frameworks, Plasma.
Herald added a project: Frameworks.
fvogt requested review of this revision.

REVISION SUMMARY
  This rework fixes several issues:
  
  - Qt wasn't informed about XCB_MAPPING_NOTIFY anymore
  - With XKB enabled in Qt, X won't send XCB_MAPPING_NOTIFY anymore. So listen for XKB events as well.
  - Install the event filter before fetching the keysym mapping to close a race window
  - Use the old mapping for ungrabbing
  
  BUG: 350816
  BUG: 269403

TEST PLAN
  Ctrl-Alt-Y global shortcut works even when doing
  "setxkbmap us; kglobalaccel5 & sleep 1; setxkbmap de;" while it did not
  before. On some systems, this race happened on every login, now it works
  reliably.

REPOSITORY
  R268 KGlobalAccel

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D16434

AFFECTED FILES
  CMakeLists.txt
  src/runtime/plugins/CMakeLists.txt
  src/runtime/plugins/xcb/CMakeLists.txt
  src/runtime/plugins/xcb/kglobalaccel_x11.cpp
  src/runtime/plugins/xcb/kglobalaccel_x11.h

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