D17006: Compress calls to `updateSize`

[Eike Hein]

hein created this revision.
hein added reviewers: Plasma, davidedmundson.
Herald added a project: Plasma.
hein requested review of this revision.

REVISION SUMMARY
  Repeater+Flow has no reliable way to transactionize/batch insertion,
  e.g. `Flow.positionCompleted` is useless in a function that can change
  the Flow's size, and transition events like populated and similar
  aren't available. Refactoring this to be a ListView isn't appealing
  because it would mean the code loses the property of being reused for
  both the bar and the popup, and therefore is well-tested already.
  
  This brings down the number of `updateSize` calls when opening the
  dialog for a group of five from five to one.
  
  BUG:400364

REPOSITORY
  R119 Plasma Desktop

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D17006

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

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