[gnome-games] (24 commits) ...collection-view: Allow back swipe in titlebar

[Alexander Mikhaylenko <alexm src gnome org>]

Summary of changes:

  7680c6e... shortcuts-window: Ensure GThemedIcon type (*)
  502c439... collection-header-bar: Add .titlebar style class to headerb (*)
  bfa8e84... display-header-bar: Switch to HdyHeaderBar (*)
  a12c7ab... display-header-bar: Add .titlebar style class to headerbars (*)
  66d1170... application-window: Switch to HdyApplicationWindow (*)
  abe049c... ui-view: Remove title_bar property (*)
  c41894c... collection-box: Merge into CollectionView (*)
  2d14718... collection-header-bar: Merge into CollectionView (*)
  2f1a84b... collection-view: Bind subview title directly (*)
  552c8f5... ui: Introduce TitlebarBox (*)
  594080c... fullscreen-box: Port to TitlebarBox (*)
  7850a7b... display-box: Use the same headerbar in fullscreen and windo (*)
  31b5885... display-box: Merge into DisplayView (*)
  8a9e947... ui-view: Make a widget (*)
  2ec5c63... display-header-bar: Merge into DisplayView (*)
  3f8b002... application-window: Create views in XML (*)
  8b9cad3... preferences-subpage: Use HdyHeaderBar (*)
  6c3dc17... preferences-subpage: Add allow-back property (*)
  7fb9992... preferences-window: Separate selection mode and can-swipe-b (*)
  c07023c... preferences-subpage: Move headerbar within the window (*)
  ba67487... preferences-window: Port to HdyWindow (*)
  fe14008... preferences-subpage-keyboard: Simplify layout (*)
  50f98ca... preferences-subpage-gamepad: Simplify layout (*)
  d3beced... collection-view: Allow back swipe in titlebar (*)

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