[dia] diagram-as-element: avoid endless recursion for pathologic case

[Hans Breuer <hans src gnome org>]

commit 18baf69ddd944b5c7bcfc1c186a85df74c586c7e
Author: Hans Breuer <hans breuer org>
Date:   Thu Aug 5 20:19:12 2010 +0200

    diagram-as-element: avoid endless recursion for pathologic case
    
    The sample std-props-test.dia has such a pathologic case,
    a 'Misc - Diagram' object referencing the parent diagram.
    The expected endless mirror effect is stopped after the
    first iteration ;)

 objects/Misc/diagram_as_object.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/objects/Misc/diagram_as_object.c b/objects/Misc/diagram_as_object.c
index 6c62ba0..3709729 100644
--- a/objects/Misc/diagram_as_object.c
+++ b/objects/Misc/diagram_as_object.c
@@ -232,7 +232,12 @@ _dae_update_data(DiagramAsElement *dae)
   struct utimbuf utbuf;
   Element *elem = &dae->element;
   DiaObject *obj = &elem->object;
+  static int working = 0;
   
+  if (working > 1)
+    return; /* protect against infinite recursion */
+  ++working;
+
   if (   strlen(dae->filename)
 #if GLIB_CHECK_VERSION(2,18,0)
       && g_utime(dae->filename, &utbuf) == 0
@@ -268,6 +273,8 @@ _dae_update_data(DiagramAsElement *dae)
 
   /* adjust objects position, otherwise it'll jump on move */
   obj->position = elem->corner;
+
+  --working;
 }
 static void 
 _dae_destroy(DiagramAsElement *dae)