gtk-demo: Move Theming to Theming/Style Classes

And make the title :: parsing work for nested titles too,
so this works.

demos/gtk-demo/Makefile.am

@@ -43,7 +43,7 @@ demos =						\
 	stock_browser.c				\
 	textview.c				\
 	textscroll.c				\
-	theming.c				\
+	theming_style_classes.c			\
 	toolpalette.c				\
 	transparent.c				\
 	tree_store.c				\

demos/gtk-demo/main.c

@@ -623,12 +623,18 @@ load_file (const gchar *filename)
           while (*p == '/' || *p == '*' || g_ascii_isspace (*p))
             p++;
           r = p;
-          while (*r != '/' && *r != ':' && *r != '\0')
-            r++;
-          if (*r == '/')
-            p = r + 1;
-          if (r[0] == ':' && r[1] == ':')
-            *r = '\0';
+          while (*r != '\0')
+            {
+              while (*r != '/' && *r != ':' && *r != '\0')
+                r++;
+              if (*r == '/')
+                {
+                  r++;
+                  p = r;
+                }
+              if (r[0] == ':' && r[1] == ':')
+                *r = '\0';
+            }
           q = p + strlen (p);
           while (q > p && g_ascii_isspace (*(q - 1)))
             q--;

demos/gtk-demo/theming_style_classes.c

@@ -1,4 +1,4 @@
-/* Theming :: theming.ui
+/* Theming/Style Classes :: theming.ui
  *
  * GTK+ uses CSS for theming. Style classes can be associated
  * with widgets to inform the theme about intended rendering.
@@ -14,7 +14,7 @@
 static GtkWidget *window = NULL;
 
 GtkWidget *
-do_theming (GtkWidget *do_widget)
+do_theming_style_classes (GtkWidget *do_widget)
 {
   GtkWidget *grid;
   GtkBuilder *builder;