On Mac OS X, mark the entire panel as dirty when scrolling to fix artifact issues.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@3229 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/media/VirtualMediaPanel.java

@@ -1,5 +1,5 @@
 //
-// $Id: VirtualMediaPanel.java,v 1.29 2004/11/11 23:52:43 mdb Exp $
+// $Id$
 //
 // Narya library - tools for developing networked games
 // Copyright (C) 2002-2004 Three Rings Design, Inc., All Rights Reserved
@@ -229,6 +229,12 @@ public class VirtualMediaPanel extends MediaPanel
 //                      "), d=(" + _dx + ", " + _dy +
 //                      "), width=" + width + ", height=" + height + "].");
 
+
+            // Mac OS X's redraw breaks on scrolling, so we repaint the
+            // entire panel 
+            if (RunAnywhere.isMacOS()) {
+                _remgr.invalidateRegion(_nx, _ny, width, height);
+            } else {
                 // these are used to prevent the vertical strip from
                 // overlapping the horizontal strip
                 int sy = _ny, shei = height;
@@ -246,6 +252,8 @@ public class VirtualMediaPanel extends MediaPanel
                 } else if (_dx < 0) {
                     _remgr.invalidateRegion(_nx, sy, -_dx, shei);
                 }
+            }
+
 
             // now go ahead and update our location so that changes in
             // between here and the call to paint() for this tick don't