D5608: Port grouping applet to Plasma Components 3

[David Edmundson]

davidedmundson created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  I want to add a feature which is quite difficult with QtQuick Controls
  1's tab bar, but should be easy with QQC2.
  
  May as well port our first applet.
  
  Might wait till 5.11? Especially due to https://phabricator.kde.org/D5603

TEST PLAN
  - ran. Added some applets, removed some applets with the context menu
  - checked in gammaray that nothing was abnormal
  - ran in reverse. First tab was on the right, contents were (correctly) unaffected

REPOSITORY
  R114 Plasma Addons

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D5608

AFFECTED FILES
  applets/grouping/package/contents/ui/items/AbstractItem.qml
  applets/grouping/package/contents/ui/main.qml

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