[gtk] (12 commits) ...Merge branch 'matthiasc/for-master' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  2571a2a... reftests: Fix the window-show-contents-on-map test (*)
  dde32b5... reftests: Remove window-show-contents-on-map from xfails (*)
  ecf8e6f... widget-factory: Improve the layout on page 3 (*)
  8410e6f... widget-factory: Some cosmetics (*)
  8de774d... widget-factory: Make print a window action (*)
  f6af2d6... widget-factory: Implement the print action (*)
  2dfd140... inspector: Make the resource tab play videos (*)
  9f579ed... widget-factory: Put a video widget in (*)
  7ca8efa... vulkan: Update error codes enum (*)
  7eeeb3f... gdk: Include a default cursor as resource (*)
  e1b25ea... wayland: Fall back to an unthemed default cursor (*)
  0b6cd34... Merge branch 'matthiasc/for-master' into 'master'

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