D8149: Add support for gtk3 theme variant feature.

[Xuetian Weng]

xuetianweng created this revision.
xuetianweng added reviewers: Plasma, davidedmundson.
Restricted Application added a project: Plasma.

REVISION SUMMARY
  Gtk3 supports theme variant feature, which allows application to specify
  a variant theme to use.

TEST PLAN
  Test with gtk3-demo -> Application Class, select prefer dark theme, also test
  with GTK_THEME=Breeze:dark

REPOSITORY
  R98 Breeze for Gtk

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D8149

AFFECTED FILES
  Breeze-gtk/gtk-3.0/gtk-dark.css
  Breeze-gtk/gtk-3.18/gtk-dark.css
  Breeze-gtk/gtk-3.20/gtk-dark.css

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