[gtk] (14 commits) ...Merge branch 'wip/matthiasc/context-menu' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  a28d5d1... text, entry: Implement context menu api (*)
  6030465... text: Add a context action for visibility (*)
  1b21d6e... password entry: Adapt to new context menu api (*)
  964b257... label: Redo context menus (*)
  037e205... textview: Redo context menus (*)
  f12057b... textview: Support toggle actions (*)
  441a9df... gtk-demo: Rewrite the search entry demo (*)
  fcf92eb... widget-factory: Redo the context menu example (*)
  3dd7b41... cell renderer: remove populate-popup (*)
  0509f8c... places sidebar: remove populate-popup (*)
  10ce207... treeview: Stop disabling the context menu (*)
  6452aee... link button: Use new context menu api (*)
  6f12c39... color chooser: Use a popover menu (*)
  121011b... Merge branch 'wip/matthiasc/context-menu' into 'master'

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