[gtk] (17 commits) Non-fast-forward update to branch matthiasc/for-master

[Matthias Clasen <matthiasc src gnome org>]

The branch 'matthiasc/for-master' 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:

  84ed17b... docs: Cosmetics

Commits added to the branch:

  4fb70c5... gtk/window: remove GtkWindowGeometryInfo from public header (*)
  01b94db... Merge branch 'matthiasc/for-master' into 'master' (*)
  38166a6... NEWS: Updates (*)
  e383547... Update German translation (*)
  51a6b29... Update German translation (*)
  36b4995... Updated Lithuanian translation (*)
  cf623ce... Merge branch 'window-geometry-info' into 'master' (*)
  fe7b11b... Adwaita: increase contrast of popover separators (*)
  874b19b... Merge branch 'wip/jimmac/popover-separators' into 'master' (*)
  8f585f7... video: Realize the media stream before setting a file (*)
  7901ab8... media: Add support for OpenGL to GtkGstMediaFile (*)
  53fe751... media: Convince gstreamer to deliver GL memory (*)
  536a67e... media: Only force GL if we're using a GL renderer (*)
  fb31581... gtk-demo: Use GtkVideo in the fishbowl (*)
  40c10f8... Merge branch 'matthiasc/gl-media-stream' into 'master' (*)
  9595d44... docs: Flesh out Popup layout docs
  e141d61... docs: Cosmetics

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