[gtk] (18 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:

  0d6b5c8... Focus ring experiments
  5200ae7... Stop using the -gtk-icon-them style property
  39c25c9... css: keep a ref on the icon theme
  82d6ac3... css: Drop the -gtk-icon-theme property
  57dc57a... widget: Add a system_setting_changed vfunc
  69cfc93... window: Use gtk_system_setting_change
  922827f... settings: Call gtk_system_setting_changed
  0daedb7... icontheme: Call gtk_system_setting_changed
  ef1beb6... image: Invalidate icon helper when icon theme changes
  d9e484d... spinner: Update when gtk-enable-animation changes
  0110209... widget: Update when font settings change
  a86a08e... Drop gtk_style_context_reset_widgets
  745d488... widget: Add missing callback annotation
  c54e0c1... placesview: Fix up the address entry help popover
  1e71f7f... icon-theme: Fix deadlock in GktIconTheme dispose
  974d163... Revert "css: keep a ref on the icon theme"

Commits added to the branch:

  0ebcf8c... placesview: Fix up the address entry help popover (*)
  8e2ffb3... widget: Add missing callback annotation (*)
  30c386d... Merge branch 'missing-annotation' into 'master' (*)
  e026a04... Merge branch 'fix-placesview-popover' into 'master' (*)
  e75bc28... icon-theme: Fix deadlock in GktIconTheme dispose
  9861173... Stop using the -gtk-icon-theme style property
  7aeef71... css: Get the icon theme via the settings
  2ddff87... css: Drop the -gtk-icon-theme property
  fe6ef52... icontheme: Keep a serial
  7b4b15f... css: Compare icon theme serials
  35439fe... widget: Add a system_setting_changed vfunc
  a3437a2... window: Use gtk_system_setting_change
  5f31de3... settings: Call gtk_system_setting_changed
  9956ee2... icontheme: Call gtk_system_setting_changed
  1cd4600... image: Invalidate icon helper when icon theme changes
  f959a32... spinner: Update when gtk-enable-animation changes
  82ce361... widget: Update when font settings change
  4898aab... Drop gtk_style_context_reset_widgets

(*) This commit already existed in another branch; no separate mail sent