[gtk] (13 commits) ...Merge branch 'a11y-fixes' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  b3f5243... a11y: Report children of widgets (*)
  d01070d... a11y: Add an accessible for widgets with children (*)
  145ccfe... stackswitcher: Use a composite accessible (*)
  18965ee... testsuite: Update some a11y tests (*)
  580384e... tests: Update expected output (*)
  bc682be... colorchooser: Use a composite accessible (*)
  a11b1bd... testsuite: Update expected output (*)
  2dba92f... tests: Fix infobars in ui files (*)
  b916723... testsuite: Improve --generate support (*)
  048effd... testsuite: Clean up a11y menu tests (*)
  769dae2... infobar: Implement forall (*)
  e45b668... testsuite: Misc. updates of expected output (*)
  cf69b7d... Merge branch 'a11y-fixes' into 'master'

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