test/Editor was freeing the text buffer too soon and no clearing callbacks. (STR #2294)

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@7106 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

CHANGES

@@ -1,5 +1,7 @@
 CHANGES IN FLTK 1.3.0
 
+	- Fixed crash in test/Editor when freeing buffer 
+	  too soon (STR #2294) 
 	- Fixed Fl_Preferences Cygwin wide character bug (STR #2164)
 	- Fixed sorting in Fl_Browser - last item would not 
 	  be sorted (STR #2300)

test/editor.cxx

@@ -609,14 +609,19 @@ void paste_cb(Fl_Widget*, void* v) {
 int num_windows = 0;
 
 void close_cb(Fl_Widget*, void* v) {
-  Fl_Window* w = (Fl_Window*)v;
-  if (num_windows == 1 && !check_save()) {
-    return;
+  EditorWindow* w = (EditorWindow*)v;
+
+  if (num_windows == 1) {
+    if (!check_save())
+      return;
   }
 
   w->hide();
+  w->editor->buffer(0);
+  textbuf->remove_modify_callback(style_update, w->editor);
   textbuf->remove_modify_callback(changed_cb, w);
   Fl::delete_widget(w);
+  
   num_windows--;
   if (!num_windows) exit(0);
 }