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Net's redraw function now uses the `dir' argument to determine whether it's
redrawing an undo. Seems to work.

[originally from svn r4470]

--- a/net.c

+++ b/net.c

@@ -1323,11 +1323,9 @@

         break_label:

         if (tx >= 0) {

-            if (tile(state, tx, ty) == ROT(tile(oldstate, tx, ty),

-                                           state->last_rotate_dir))

-                angle = state->last_rotate_dir * 90.0F * (t / ROTATE_TIME);

-            else

-                angle = state->last_rotate_dir * -90.0F * (t / ROTATE_TIME);

+            int last_rotate_dir = dir==-1 ? oldstate->last_rotate_dir :

+                                            state->last_rotate_dir;

+            angle = last_rotate_dir * dir * 90.0F * (t / ROTATE_TIME);

             state = oldstate;

         }

     }