D8845: Create tooltipManager on demand

[Kai Uwe Broulik]

broulik created this revision.
broulik added a reviewer: mart.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  It takes a couple of milliseconds to be created and isn't vital for System Settings startup.

TEST PLAN
  Tooltips still work

REPOSITORY
  R124 System Settings

REVISION DETAIL
  https://phabricator.kde.org/D8845

AFFECTED FILES
  sidebar/SidebarMode.cpp

To: broulik, mart
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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