[gtk] (15 commits) ...Merge branch 'kill-hierarchy-changed' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  4724943... inspector: Stop using ::hierarchy-changed (*)
  ddb52a5... drag dest: Stop using ::hierarchy-changed (*)
  de6132a... ime: Stop using ::hierarchy-changed (*)
  9591d40... xim: Stop using ::hierarchy-changed (*)
  3ebf19b... text handle: Stop using ::hierarchy-changed (*)
  9e231f6... popover: Stop using ::hierarchy-changed (*)
  55337c5... file chooser: Stop using ::hierarchy-changed (*)
  0230a7b... header bar: Stop using ::hierarchy-changed (*)
  ef5108c... label: Stop using ::hierarchy-changed (*)
  3ccbcf9... menu bar: Stop using ::hierarchy-changed (*)
  8d93321... gtk-demo: Stop using ::hierarchy-changed (*)
  5dd0863... widget: Drop ::hierarchy-changed (*)
  a3901f2... Drop the anchored field (*)
  89470ab... Document that root and unroot must chain up (*)
  ccbaec0... Merge branch 'kill-hierarchy-changed' into 'master'

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