D7173: Guard every remaining access to rootInfo

[Martin Flöser]

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

REVISION SUMMARY
  For a future XFree KWin. Only remaining not guarded usages are in
  Workspace::init, but that one needs to be refactored anyway for
  becoming X free.

TEST PLAN
  Compiles

REPOSITORY
  R108 KWin

BRANCH
  rootinfo-guard

REVISION DETAIL
  https://phabricator.kde.org/D7173

AFFECTED FILES
  geometry.cpp
  layers.cpp
  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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