*** vnc.c	30 Sep 2007 13:01:15 -0000	1.25
--- vnc.c	3 Oct 2007 18:44:17 -0000
@@ -289,15 +289,19 @@
     ds->width = w;
     ds->height = h;
     ds->linesize = w * vs->depth;
-    if (vs->csock != -1 && vs->has_resize && size_changed) {
-	vnc_write_u8(vs, 0);  /* msg id */
-	vnc_write_u8(vs, 0);
-	vnc_write_u16(vs, 1); /* number of rects */
-	vnc_framebuffer_update(vs, 0, 0, ds->width, ds->height, -223);
-	vnc_flush(vs);
-	vs->width = ds->width;
-	vs->height = ds->height;
+    if (size_changed) {
+        if (vs->csock != -1 && vs->has_resize) {
+            vnc_write_u8(vs, 0);  /* msg id */
+            vnc_write_u8(vs, 0);
+            vnc_write_u16(vs, 1); /* number of rects */
+            vnc_framebuffer_update(vs, 0, 0, ds->width, ds->height, -223);
+            vnc_flush(vs);
+        }
+        memset(vs->dirty_row, 0xFF, sizeof(vs->dirty_row));
+        memset(vs->old_data, 42, ds->linesize * ds->height);
     }
+    vs->width = ds->width;
+    vs->height = ds->height;
 }
 
 /* fastest code */