D17542: Reset parentItem when mainItem changes

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, mart.
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REVISION SUMMARY
  Otherwise we'll keep piling up custom tooltip items in the dialog. They're invisible but they're still there.

TEST PLAN
  Kept the contentItem visible, moved between TM and kickoff, tooltip no longer ends up with multiple items in it:
  Before:
  F6473103: Screenshot_20181212_151924.png <https://phabricator.kde.org/F6473103>
  They're not "leaked" as it doesn't change ownership (`parent` vs `parentItem`) but it still adds unnccessary invisible items to the window

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D17542

AFFECTED FILES
  src/plasmaquick/dialog.cpp

To: broulik, #plasma, mart
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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