如何控制GTK行间文本间距

#include <gtk/gtk.h>
#include <pango/pango.h>

static void activate(GtkApplication *app, gpointer user_data) {
    GtkWidget *window;
    GtkWidget *label;
    PangoLayout *layout;
    PangoFontDescription *font_desc;

    window = gtk_application_window_new(app);
    gtk_window_set_title(GTK_WINDOW(window), "Line Spacing Example");
    gtk_window_set_default_size(GTK_WINDOW(window), 400, 200);

    label = gtk_label_new(NULL);
    gtk_label_set_text(GTK_LABEL(label), "This is an example of line spacing in GTK.\n"
                                          "You can adjust the line spacing to make the text more readable.");

    // Get the PangoLayout from the label
    layout = gtk_label_get_layout(GTK_LABEL(label));

    // Create a font description
    font_desc = pango_font_description_new();
    pango_font_description_set_family(font_desc, "Sans");
    pango_font_description_set_size(font_desc, 12 * PANGO_SCALE);

    // Set the font description to the layout
    pango_layout_set_font_description(layout, font_desc);

    // Set the line spacing
    pango_layout_set_spacing(layout, 5 * PANGO_SCALE); // Adjust the spacing value as needed

    // Free the font description
    pango_font_description_free(font_desc);

    gtk_container_add(GTK_CONTAINER(window), label);
    gtk_widget_show_all(window);
}

int main(int argc, char **argv) {
    GtkApplication *app;
    int status;

    app = gtk_application_new("org.gtk.example", G_APPLICATION_FLAGS_NONE);
    g_signal_connect(app, "activate", G_CALLBACK(activate), NULL);
    status = g_application_run(G_APPLICATION(app), argc, argv);
    g_object_unref(app);

    return status;
}