D21860: Set a font for gtk applications in the fonts kcm

[Mikhail Zolotukhin]

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

REVISION SUMMARY
  To increase usability, fonts for gtk applications is now set in respective fonts kcm, instead of separate gtk kcm.
  
  Not sure if we should provide option to modify font only for gtk applications: why would anyone need to set different fonts for gnome and kde apps?
  
  Note: if fonts configuration option will be removed from kde-gtk-config, this patch will be needed (D21524 <https://phabricator.kde.org/D21524>), so gtk2rc file won't be overridden without font string.
  
  Depends on D21524 <https://phabricator.kde.org/D21524>
  
  BUG: 138866

TEST PLAN
  Check if fonts in gtk2 and gtk3 apps are set correctly, after changing General Font.

REPOSITORY
  R119 Plasma Desktop

BRANCH
  set-gtk-font-in-fonts-kcm (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D21860

AFFECTED FILES
  kcms/fonts/fonts.cpp
  kcms/fonts/fonts.h

To: gikari, #vdg
Cc: plasma-devel, LeGast00n, jraleigh, fbampaloukas, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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