[gtk+/win32-theme] win32-theme: The theme class is case insensitive, so treat it as such

[Alexander Larsson <alexl src gnome org>]

commit f6189b4e6d9f811b5355753a7c35baf54b0dd059
Author: Alexander Larsson <alexl redhat com>
Date:   Wed Nov 16 12:17:02 2011 +0100

    win32-theme: The theme class is case insensitive, so treat it as such
    
    We always lower the strings so that lookups with different cases
    get the same HTHEME.

 gtk/gtkwin32theme.c |   24 ++++++++++++++++--------
 1 files changed, 16 insertions(+), 8 deletions(-)
---
diff --git a/gtk/gtkwin32theme.c b/gtk/gtkwin32theme.c
index aec62f9..f215017 100644
--- a/gtk/gtkwin32theme.c
+++ b/gtk/gtkwin32theme.c
@@ -144,21 +144,29 @@ lookup_htheme_by_classname (const char *class)
 {
   HTHEME theme;
   guint16 *wclass;
+  char *lower;
   
-  theme = (HTHEME)  g_hash_table_lookup (hthemes_by_class, class);
-  if (theme)
-    return theme;
+  lower = g_ascii_strdown (class, -1);
 
-  wclass = g_utf8_to_utf16 (class, -1, NULL, NULL, NULL);
+  theme = (HTHEME)  g_hash_table_lookup (hthemes_by_class, lower);
+  if (theme)
+    {
+      g_free (lower);
+      return theme;
+    }
 
+  wclass = g_utf8_to_utf16 (lower, -1, NULL, NULL, NULL);
   theme  = open_theme_data (NULL, wclass);
-
   g_free (wclass);
 
   if (theme == NULL)
-    return NULL;
-    
-  g_hash_table_insert (hthemes_by_class, g_strdup (class), theme);
+    {
+      g_free (lower);
+      return NULL;
+    }
+
+  /* Takes ownership of lower: */
+  g_hash_table_insert (hthemes_by_class, lower, theme);
 
   return theme;
 }