D18797: [Tooltips] Use 24px size for children to improve display, just like KInfoCenter

[Nathaniel Graham]

ngraham created this revision.
ngraham added a reviewer: VDG.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
ngraham requested review of this revision.

REVISION SUMMARY
  Adopt the same code that KInfoCenter uses for this tooltip and hardcode a 24px icon size
  for tooltip child items instead of using the `KIconLoader::MainToolbar` size (which is
  not really semantically correct anyway, since this is not a main toolbar).
  
  BUG: 386748
  FIXED-IN: 5.12.8

TEST PLAN
  F6592223: Correct child item icons <https://phabricator.kde.org/F6592223>

REPOSITORY
  R124 System Settings

BRANCH
  Plasma/5.12

REVISION DETAIL
  https://phabricator.kde.org/D18797

AFFECTED FILES
  sidebar/ToolTips/tooltipmanager.cpp

To: ngraham, #vdg
Cc: plasma-devel, jraleigh, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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