Why is there no a border on this GtkFrame?

Question

I'm reading tutorials on GtkFrame, I have compile some code examples, but unlike screnhoot of the tutorial, but my program using GtkFrame don't have a border.

The following code:

#include <gtk/gtk.h>

int main( int   argc,
          char *argv[] )
{
  /* GtkWidget is the storage type for widgets */
  GtkWidget *window;
  GtkWidget *frame;
  GtkWidget *button;
  GtkWidget *label;
  gint i;

  /* Initialise GTK */
  gtk_init(&argc, &argv);

  /* Create a new window */
  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_window_set_title(GTK_WINDOW(window), "Frame Example");

  /* Here we connect the "destroy" event to a signal handler */ 
  g_signal_connect (G_OBJECT (window), "destroy",
                      G_CALLBACK (gtk_main_quit), NULL);

  gtk_widget_set_size_request(window, 300, 300);
  /* Sets the border width of the window. */
  gtk_container_set_border_width (GTK_CONTAINER (window), 10);

  label = gtk_label_new("foo");

  /* Create a Frame */
  frame = gtk_frame_new(NULL);
  gtk_container_add(GTK_CONTAINER(frame), label);
  gtk_widget_set_size_request(frame, 30, 30);

  gtk_container_add(GTK_CONTAINER(window), frame);

  /* Set the frame's label */
  gtk_frame_set_label( GTK_FRAME(frame), "GTK Frame Widget" );

  /* Set the style of the frame */
  gtk_frame_set_shadow_type( GTK_FRAME(frame), GTK_SHADOW_ETCHED_OUT);

  gtk_widget_show(frame);

  /* Display the window */
  gtk_widget_show (window);

  /* Enter the event loop */
  gtk_main ();

  return(0);
}
/* example-end */

Generate the program:

What am I missing?

Answer 1

This is GTK bug 659926. However, it seems this is mostly due to the fact that the Adwaita theme (default GNOME 3 theme) ignores the frames, so maybe changing the theme (using gnome-tweak-tool, if you want to use a GUI) will do the trick. However I think frames are abused in many GUIs and often lead to ugly interfaces, as they add visual clutter. Less is better.