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Typo affecting gameplay on grids wider than they are tall. (Clicking
in columns with x > h was being erroneously rejected.)

[originally from svn r8886]

--- a/blackbox.c

+++ b/blackbox.c

@@ -372,7 +372,7 @@

     int ret, x1 = state->w+1, y1 = state->h+1;

     if (x > 0 && x < x1 && y > 0 && y < y1) return 0; /* in arena */

-    if (x < 0 || x > y1 || y < 0 || y > y1) return 0; /* outside grid */

+    if (x < 0 || x > x1 || y < 0 || y > y1) return 0; /* outside grid */

     if ((x == 0 || x == x1) && (y == 0 || y == y1))

         return 0; /* one of 4 corners */