Allison Karlitskaya authored Jun 29, 2011 and Sébastien Bacher committed Jun 29, 2011

This commit represents an API break to GAction in the following ways:

  - the 'set_state' entry in the GActionInterface vtable has been
    renamed to 'change_state'.  The number and order of vtable items has
    not otherwise changed.

  - g_action_set_state() has been renamed to g_action_change_state() to
    match the updated vtable entry.

  - the "state" property of the GAction interface has been changed to
    read-only to reflect the fact that g_action_set_state() no longer
    exists.

  - GSimpleActionClass has been hidden.  GSimpleAction can no longer be
    subclassed.

>> Rationale

g_action_set_state() has never been a true setter in the sense that
calling it will update the value of the "state" property.  It has always
been closer to "request 'state' to be changed to this value" with
semantics defined by the implementor of the interface.  This is why the
equivalent method in GActionGroup had its name changed from 'set' to
'change'.  This change...