Change visibility and connect/disconnect signal.

        Args:
            state (bool): Activate/deactivate.

def on_state_changed(self, state):
        """Change visibility and connect/disconnect signal.

        Args:
            state (bool): Activate/deactivate.
        """
        if state:
            self.editor.sig_breakpoints_changed.connect(self.repaint)
            self.editor.sig_debug_stop.connect(self.set_current_line_arrow)
            self.editor.sig_debug_stop[()].connect(self.stop_clean)
            self.editor.sig_debug_start.connect(self.start_clean)
        else:
            self.editor.sig_breakpoints_changed.disconnect(self.repaint)
            self.editor.sig_debug_stop.disconnect(self.set_current_line_arrow)
            self.editor.sig_debug_stop[()].disconnect(self.stop_clean)
            self.editor.sig_debug_start.disconnect(self.start_clean)