[gtk] (5 commits) Non-fast-forward update to branch fix-icontheme-invalidation

[Matthias Clasen <matthiasc src gnome org>]

The branch 'fix-icontheme-invalidation' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  cfc8001... icontheme: Call gtk_system_setting_changed
  31fdfdf... image: Invalidate icon helper when icon theme changes
  3feb1cb... spinner: Update when gtk-enable-animation changes
  8c5f5b9... widget: Update when font settings change
  7853f9b... Drop gtk_style_context_reset_widgets

Commits added to the branch:

  36cf55e... settings: invalidate styles when animations change
  e72319e... icontheme: Call gtk_system_setting_changed
  9efcd3f... image: Invalidate icon helper when icon theme changes
  e45cd87... widget: Update when font settings change
  5d327ae... Drop gtk_style_context_reset_widgets