Called when sig_option_changed is received.

        If option being changed is autosave_mapping, then synchronize new
        mapping with all editor stacks except the sender.

def received_sig_option_changed(self, option, value):
        """
        Called when sig_option_changed is received.

        If option being changed is autosave_mapping, then synchronize new
        mapping with all editor stacks except the sender.
        """
        if option == 'autosave_mapping':
            for editorstack in self.editorstacks:
                if editorstack != self.sender():
                    editorstack.autosave_mapping = value
        self.sig_option_changed.emit(option, value)