D25983: Update size hint when font changes

[Kai Uwe Broulik]

broulik created this revision.
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REVISION SUMMARY
  Ensures controls update their size when font changes.
  The Labels inside would but the control around them not, leading to broken rendering until causing it to update by interacting with it.
  It has to be queued for some reason or else by the time the signal is invoked, the style hasn't caught up yet.

TEST PLAN
  *Changed from 10pt to 12pt
  Before:
  The one I hovered updated half-way
  F7817652: Screenshot_20191214_114627.png <https://phabricator.kde.org/F7817652>
  After:
  All controls update immediately
  F7817653: Screenshot_20191214_114546.png <https://phabricator.kde.org/F7817653>

REPOSITORY
  R858 Qt Quick Controls 2: Desktop Style

REVISION DETAIL
  https://phabricator.kde.org/D25983

AFFECTED FILES
  plugin/kquickstyleitem.cpp

To: broulik, #plasma
Cc: plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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