D6697: Allow to change toolbar font separately again

[Henrik Fehlauer]

rkflx planned changes to this revision.
rkflx added a comment.


  No review in over a month. On the positive side, I got more ideas in the meantime.
  
  Let's see if I can find another way to change the toolbar font without affecting single QToolButtons. Things to try (maybe even both, depending on release schedules):
  
  - add ToolbarFont in Qt (similar additions done before, since no BC promised for QPA)
  - set ToolbarFont via `QApplication::setFont(toolbarFont, "QToolBar");` (inspired by https://phabricator.kde.org/R446:26cb58c1a2fa41691ea9f2727dea65e380feb384) (works perfectly via main.cpp, not sure how to do it via platformtheme yet)
  
  Meanwhile, if there are any other comments (especially regarding what new default to pick), please share ;)

REPOSITORY
  R135 Integration for Qt applications in Plasma

REVISION DETAIL
  https://phabricator.kde.org/D6697

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