D15225: Activate clients on drag enter

romangg created this revision.
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REVISION SUMMARY
  We currently only raise a client when a drag enters it and not activate it.
  This is confusing since afterwards the raised window has not keyboard focus
  although visually being in front of the window the drag originated from.
  
  Therefore activate entered windows instead of only raising them.

TEST PLAN
  Manually and autotests still pass.

REPOSITORY
  R108 KWin

BRANCH
  activateClientsOnDrag

REVISION DETAIL
  https://phabricator.kde.org/D15225

AFFECTED FILES
  input.cpp

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