[gtk] (18 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:

  fd3e1c4... surface: Be more lenient for autohide
  5a2f738... surface: Be smarter about autohide
  08aa4cd... Cosmetics

Commits added to the branch:

  fd52220... Merge branch 'matthiasc/for-master' into 'master' (*)
  499e4b4... broadway: Set modifier state of scroll events (*)
  30210c7... a11y: Move ATContext to an explicit realization model (*)
  dafb2b0... a11y: Allow updating role on unrealized contexts (*)
  bb24b35... gtk-demo: Set an accessible role (*)
  828a067... Propagate accessible-role to backend (*)
  ae9758b... a11y: Unrealize ATContext on dispose (*)
  425d8ad... Set accessible label on GTK Demo's primary menu (*)
  d88f7c9... a11y: Use the tooltip text as the accessible description (*)
  72415ea... a11y: Make the Button labelled by its child label (*)
  ba63aa7... a11y: Move parent context ref getter to its own function (*)
  f220a1e... gtk-demo: Set some accessible properties (*)
  d2a7ecf... gtk-demo: Simplify the run button (*)
  23c4256... Merge branch 'a11y/atcontext-realize' into 'master' (*)
  75f96b8... surface: Be more lenient for autohide
  dcfb6e5... surface: Be smarter about autohide
  d2cc936... Cosmetics
  8ae415a... popovermenu: Fail gracefully if no model

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