[gtk+] gtkdnd: Use symbolic names for button numbers

[Carlos Garcia Campos <carlosgc src gnome org>]

commit 6e9b06028cc506932cb0c21849904557d0598855
Author: Carlos Garcia Campos <cgarcia igalia com>
Date:   Wed Jan 25 18:26:04 2012 +0100

    gtkdnd: Use symbolic names for button numbers

 gtk/gtkdnd.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkdnd.c b/gtk/gtkdnd.c
index bcd7a29..f77cc7e 100644
--- a/gtk/gtkdnd.c
+++ b/gtk/gtkdnd.c
@@ -732,7 +732,7 @@ gtk_drag_get_event_actions (GdkEvent *event,
 	  break;
 	}
 
-      if ((button == 2 || button == 3) && (actions & GDK_ACTION_ASK))
+      if ((button == GDK_BUTTON_MIDDLE || button == GDK_BUTTON_SECONDARY) && (actions & GDK_ACTION_ASK))
 	{
 	  *suggested_action = GDK_ACTION_ASK;
 	  *possible_actions = actions;