D6231: Fix DND onto Task Manager for groups, group dialog scrollbar

[Eike Hein]

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

REVISION SUMMARY
  With this patch drag-hover activation will work for group children,
  and moving between different group parents while dragging will
  correctly refresh the dialog contents.
  BUG:379888
  
  The patch also makes GroupDialog more similar to CompactApplet in
  desktoppackage/, in particular managing applet status and activa-
  ting the window explicitly. There is no concrete reason for this,
  but it seemed like a good idea while debugging the DND issues.
  
  Further, while inverting the MouseHandler<>ScrollArea nesting I
  removed some dodgy geometry-setting code for the inside item, and
  the ScrollArea viewport now is a single item. This very likely
  addresses some reports that the scrollbar sometimes wouldn't appear
  when required.
  BUG:379037

REPOSITORY
  R119 Plasma Desktop

BRANCH
  Plasma/5.8

REVISION DETAIL
  https://phabricator.kde.org/D6231

AFFECTED FILES
  applets/taskmanager/package/contents/ui/GroupDialog.qml

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