[gtk] (9 commits) ...Merge branch 'wip/otte/for-master' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  dee863d... rendernode: Bail if matrix is invalid (*)
  2a8f371... gtk-demo: Don't put the search bar in the scroll area (*)
  d6f2884... video: When autoplaying, start playing once the video is pr (*)
  f7f8990... picture: Fix copy/paste error in docs (*)
  8d014d6... roundedbox: Remove unused API (*)
  f85d939... docs: Put render nodes in their own sections (*)
  71e616d... listview: Use the correct scroll policy (*)
  96e1b85... gdkarray: Add a "stolen" boolean to splice() (*)
  7e579bb... Merge branch 'wip/otte/for-master' into 'master'

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