[gtk] (14 commits) ...Merge branch 'a11y-debug' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  aa09737... atspicontext: Remove an unused field (*)
  9fbd11e... a11y: Add the root object to the cache (*)
  9e8187b... a11y: Track window states more closely (*)
  a455db0... a11y: Actually set accessible roles (*)
  5f2c08c... a11y: Make things appear on focus in (*)
  ae83b79... a11y: Emit focus events (*)
  1a944b2... stackswitcher: Set accessible label properties (*)
  639932a... a11y: Emit window:activate event (*)
  b97d0a3... a11y: Avoid spurious selection changed events (*)
  99750ac... a11y: Realize notebook tabs when switching (*)
  8f91451... a11y: Pair window:activate with window:deactivate signal (*)
  57cc2c4... a11y: Set state on the GtkTreeExpander widget (*)
  b24fedd... a11y: Update the labelled-by relation of GtkTreeExpander (*)
  dcb5a74... Merge branch 'a11y-debug' into 'master'

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