我在MSYS2上使用GTK+3。我想将宽度设置为GtkWidget的1，但我不能，所以请如何做？

#include <gtk/gtk.h>

int main(int argc, char *argv[]) {
    gtk_init(&argc, &argv);
    GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    g_signal_connect(G_OBJECT(window), "destroy", G_CALLBACK(gtk_main_quit), NULL);

    GtkWidget *label = gtk_label_new("Hello, World!");
    gtk_container_add(GTK_CONTAINER(window), label);

    // I want to set width to 1! 
    gtk_widget_set_size_request(label, 1, -1);

    gtk_widget_show_all(window);
    gtk_main();
    return 0;
}

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