D15234: Remove breaking pointer constraints functionality

romangg created this revision.
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REVISION SUMMARY
  With 2694839099c3 <https://phabricator.kde.org/R108:2694839099c3a0e9da3682569e1bd569247c3ae8>, 0bd5eff8623d <https://phabricator.kde.org/R108:0bd5eff8623dceb6e2dee445edcc244ccb620660> and f0ba436c724e <https://phabricator.kde.org/R108:f0ba436c724e32103bfdc584a636d4a8ea2a0d49> it is now possible to
  unconstrain a pointer by killing the client or deactivating the window, for
  example by switching the window via the TabBox.
  
  A user should always be able to do it therefore without needing to explicitly
  break the pointer constrain as in the past with the Esc key.
  
  Therefore remove the functionality and also remove the OSD announcing it,
  which was often shown at the wrong time.

TEST PLAN
  Manually and auto test adapted.

REPOSITORY
  R108 KWin

BRANCH
  pointerConstraintsCleanup

REVISION DETAIL
  https://phabricator.kde.org/D15234

AFFECTED FILES
  autotests/integration/pointer_constraints_test.cpp
  input.cpp
  input.h
  pointer_input.cpp
  pointer_input.h

To: romangg, #kwin
Cc: kwin, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart