D5287: Backport 5.9/Master's GroupDialog code to 5.8.

[Eike Hein]

hein created this revision.
Restricted Application added a project: Plasma.

REVISION SUMMARY
  This brings us to a common baseline on the three active branches
  and addresses regressions on the 5.8 branch.
  
  5.9's code added a scrollbar and improved keyboard nav.
  
  BUG:378042

REPOSITORY
  R119 Plasma Desktop

BRANCH
  Plasma/5.8

REVISION DETAIL
  https://phabricator.kde.org/D5287

AFFECTED FILES
  applets/taskmanager/package/contents/ui/GroupDialog.qml
  applets/taskmanager/package/contents/ui/MouseHandler.qml
  applets/taskmanager/package/contents/ui/Task.qml
  applets/taskmanager/package/contents/ui/main.qml

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