rem: gtk_grab_remove(screen.load_file_popup); gtk_widget_destroy(screen.load_file_popup); screen.load_file_popup = NULL;
add: gtk_grab_remove(screen.win.load_file); gtk_widget_destroy(screen.win.load_file); screen.win.load_file = NULL;
context: cb_cancel_load_file(GtkWidget *widget, gpointer data){    gtk_grab_remove(screen.load_file_popup);    gtk_widget_destroy(screen.load_file_popup);    screen.load_file_popup = NULL;    return;} /* cb_cancel_load_file */