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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...
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