D1772: Port custom collasablebutton to KWidgetAddons::KCollapsibleGroupBox

[David Edmundson]

davidedmundson abandoned this revision.

REPOSITORY
  R104 KScreen

REVISION DETAIL
  https://phabricator.kde.org/D1772

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