gtk_widget_add_events( 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 );
g_signal_handler_block( textview, win->mouse_click_handler );
gtk_widget_add_events( 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 );
g_signal_handler_block( textview, win->mouse_click_handler );