[gtk] (20 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:

  7a7e77e... demo: Add more accessibility labels to the UI
  13d8345... a11y: Add role exception for GtkScrolledWindow
  14f56d7... a11y: Ignore more structural roles when computing labels
  52adef5... a11y: Icons in WindowControls are presentational only
  9ab5eea... Unrealize the ATContext in StackPage on dispose
  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
  9f3148c... a11y: Implement atspi.Text.ScrollSubstringTo for GtkTextVie

Commits added to the branch:

  056a073... searchbar: Fix clearing search entry on hide (*)
  1f9eb5c... Merge branch 'clear-search-entry' into 'master' (*)
  0d6e4f7... demo: Add more accessibility labels to the UI
  429c7fc... a11y: Add role exception for GtkScrolledWindow
  e940704... a11y: Ignore more structural roles when computing labels
  bfb054a... a11y: Icons in WindowControls are presentational only
  a59889a... Unrealize the ATContext in StackPage on dispose
  d34936c... Handle empty stack pages when creating an ATContext
  995daa1... a11y: GtkStack is a group of stack pages
  e49e084... a11y: Use the stack page title as its accessible label
  87f92a9... a11y: Add more accessibility labels to GtkNotebook
  f8bb206... a11y: Icons in buttons are presentational
  d4ddfdc... a11y: Set the role on GtkSearchBar
  ebda736... a11y: Mark SearchEntry icons as presentational
  61e980b... a11y: Add accessible actions to GtkSearchEntry
  75f9b83... Establish a control relation between demo search and list
  0d7fcdd... a11y: Add more accessible data to GtkTreeExpander
  b9ad317... a11y: Document GtkRevealer's accessible state
  abc9b40... a11y: Implement atspi.Text.ScrollSubstringTo for GtkTextVie
  8203d9c... a11y: Use GROUP role for ShortcutsShortcut

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