Change NSDocument's -windowForSheet implementation to match the actual

OS X implementation.


git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@27620 72102866-910b-0410-8b05-ffd578937521

ChangeLog

@@ -1,3 +1,8 @@
+2009-01-17  Wolfgang Lux  <wolfgang.lux@gmail.com>
+
+	* Source/NSDocument.m (-windowForSheet): Return nil if the
+	document has no window controllers.
+
 2009-01-16 12:04-EST Gregory John Casamento <greg_casamento@yahoo.com>
 
 	* Source/NSMenuItem.m: Retain the GSMenuSeparator instance if

Source/NSDocument.m

@@ -353,7 +353,13 @@ withContentsOfURL: (NSURL *)url
       return win;
     }
 
-  return [NSApp mainWindow];
+  /* Note: While Apple's documentation says that this method returns
+   * [NSApp mainWindow] if the document has no window controllers, the
+   * actual implementation returns nil and, in fact, the header files
+   * on OS X also say so. Since it would be very unreasonable to attach a
+   * document modal sheet to a window that doesn't belong to this document,
+   * we do the same here, too. */
+  return nil;
 }
 
 /**