ref: ee059bc60c6e21077739279a7b8dd0aa28c74e76
parent: 363dadee0c87df57ac82ac99ea452ed757391869
author: Simon Tatham <anakin@pobox.com>
date: Fri Jun 10 07:34:02 EDT 2005
Disable shuffle overlap checking in the special case w=h=n. [originally from svn r5940]
--- a/twiddle.c
+++ b/twiddle.c
@@ -363,7 +363,14 @@
*/
oldtotal = prevmoves[y*rw+x];
newtotal = oldtotal + r;
- } while (abs(newtotal) < abs(oldtotal) || abs(newtotal) > 2);
+
+ /*
+ * Special case here for w==h==n, in which case
+ * there is actually no way to _avoid_ all moves
+ * repeating or undoing previous ones.
+ */
+ } while ((w != n || h != n) &&
+ (abs(newtotal) < abs(oldtotal) || abs(newtotal) > 2));
do_rotate(grid, w, h, n, params->orientable, x, y, r);