[gtk+] Icon theme: Hardcode fallback through the 'gnome' icon theme

[Matthias Clasen <matthiasc src gnome org>]

commit a093cd2a22173369424878eb6d8c38124e7aa1f9
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Oct 21 12:58:29 2013 -0400

    Icon theme: Hardcode fallback through the 'gnome' icon theme
    
    This is what we used to get through the Net/FallbackIcontheme
    setting. Nobody has ever set this setting to a different value,
    and people have come to rely on GTK+ applications getting their
    icons this way.

 gtk/gtkicontheme.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkicontheme.c b/gtk/gtkicontheme.c
index 3fe95e7..5061cfe 100644
--- a/gtk/gtkicontheme.c
+++ b/gtk/gtkicontheme.c
@@ -1255,7 +1255,12 @@ load_themes (GtkIconTheme *icon_theme)
   if (priv->current_theme)
     insert_theme (icon_theme, priv->current_theme);
 
-  /* Always look in the "default" icon theme */
+  /* Always look in the gnome and hicolor icon themes.
+   * Looking in hicolor is mandated by the spec, looking
+   * in gnome is a pragmatic solution to prevent missing
+   * icons in GTK+ applications when run under, e.g. KDE.
+   */
+  insert_theme (icon_theme, "gnome");
   insert_theme (icon_theme, DEFAULT_THEME_NAME);
   priv->themes = g_list_reverse (priv->themes);