D9152: Save an object per panel applet

[Eike Hein]

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

REVISION SUMMARY
  Instead of Item { Loader {} } just make the applet
  container the Loader. Also saves some prop bindings
  for sizing and centering the BusyIndicator, which
  still appears correct.
  
  Some props marked read-only as a bonus.

REPOSITORY
  R119 Plasma Desktop

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D9152

AFFECTED FILES
  containments/panel/contents/ui/main.qml

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