D7035: Fix group dialog no longer resizing/closing as windows are closed and the group is dissolved

[Kai Uwe Broulik]

broulik accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R119 Plasma Desktop

BRANCH
  Plasma/5.8

REVISION DETAIL
  https://phabricator.kde.org/D7035

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