D7384: Update size hints less often.

[Eike Hein]

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

REVISION SUMMARY
  The size hints were based on the size of pagerGridItem, which is derived
  from its contents. This made the size hints update as delegates were
  added, but we know ahead of time how many there will be, and what their
  size will be, so we can save some busy work.

REPOSITORY
  R119 Plasma Desktop

BRANCH
  Plasma/5.10

REVISION DETAIL
  https://phabricator.kde.org/D7384

AFFECTED FILES
  applets/pager/package/contents/ui/main.qml

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