D7097: Forward showing desktop only to rootInfo if it changed

[Martin Flöser]

graesslin created this revision.
Restricted Application added a project: KWin.
Restricted Application added subscribers: kwin, plasma-devel.

REVISION SUMMARY
  There was a property change for whenever a window gets activated although
  that doesn't change the state.
  
  In addition a nullptr check for rootInfo is added for the future no
  XWayland case.

TEST PLAN
  run xev -root to verify the property does not get updated
  needlessly

REPOSITORY
  R108 KWin

BRANCH
  showing-desktop-root-info-on-change

REVISION DETAIL
  https://phabricator.kde.org/D7097

AFFECTED FILES
  workspace.cpp

To: graesslin, #kwin, #plasma
Cc: plasma-devel, kwin, ZrenBot, progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart, lukas
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