[gtk] (11 commits) ...Merge branch 'matthiasc/for-master' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  fc720b5... gtk-demo: Don't refer to removed demos (*)
  8984fe3... Cosmetics (*)
  8f59382... widget-factory: Fix error states demo (*)
  c8a9e7f... Fix a compiler warning (*)
  4629182... filechooser: Fix setting unlisted filters (*)
  22257b1... placessidebar: Remove a pointless restriction (*)
  52304fe... gtk-demo: Add some example videos (*)
  30c3a53... video: Make autoplay work (*)
  7518fd0... gtk-demo: Make F11 toggle fullscreen (*)
  a90801e... gtk-demo: Add another demo (*)
  cddbc8f... Merge branch 'matthiasc/for-master' into 'master'

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