D8744: Use Qt.callLater instead of creating a Timer

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, hein.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

TEST PLAN
  This is new in Qt 5.8.
  The kicker dialogs are properly destroyed.
  I didn't actually see the one in FolderView being called.

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D8744

AFFECTED FILES
  applets/kicker/package/contents/ui/ItemListDialog.qml
  containments/desktop/package/contents/ui/FolderViewDialog.qml

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