[gtk] (11 commits) Non-fast-forward update to branch ebassi/for-master

[Emmanuele Bassi <ebassi src gnome org>]

The branch 'ebassi/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:

  42053be... a11y: GtkStack is a group of stack pages
  66117d3... a11y: Use the stack page title as its accessible label
  fc6e742... a11y: Add more accessibility labels to GtkNotebook
  0af8fb1... a11y: Icons in buttons are presentational
  adfa065... a11y: Set the role on GtkSearchBar
  8aea0e0... a11y: Mark SearchEntry icons as presentational
  53f3efb... a11y: Add accessible actions to GtkSearchEntry
  53a8aa0... Establish a control relation between demo search and list
  d8b342d... a11y: Add more accessible data to GtkTreeExpander
  9bcfa36... a11y: Document GtkRevealer's accessible state

Commits added to the branch:

  5d29cb7... Handle empty stack pages when creating an ATContext
  01685fb... a11y: GtkStack is a group of stack pages
  af25857... a11y: Use the stack page title as its accessible label
  cc36d49... a11y: Add more accessibility labels to GtkNotebook
  0cd67c8... a11y: Icons in buttons are presentational
  e328e1d... a11y: Set the role on GtkSearchBar
  45c11ae... a11y: Mark SearchEntry icons as presentational
  2104df5... a11y: Add accessible actions to GtkSearchEntry
  c6bf558... Establish a control relation between demo search and list
  6e32003... a11y: Add more accessible data to GtkTreeExpander
  4f0464c... a11y: Document GtkRevealer's accessible state