gtk_widget_add_events( GTK_WIDGET(textview), GDK_BUTTON_RELEASE_MASK );
win->mouse_click_handler = g_signal_connect_after( G_OBJECT(textview), "button-release-event", G_CALLBACK(on_window_button_release_event), win );
gtk_widget_add_events( GTK_WIDGET(textview), GDK_BUTTON_RELEASE_MASK );
win->mouse_click_handler = g_signal_connect_after( G_OBJECT(textview), "button-release-event", G_CALLBACK(on_window_button_release_event), win );