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Disallow clicks between squares.

[originally from svn r7400]

--- a/unequal.c

+++ b/unequal.c

@@ -1266,7 +1266,8 @@

     button &= ~MOD_MASK;

-    if (x >= 0 && x < ds->order && y >= 0 && y < ds->order) {

+    if (x >= 0 && x < ds->order && ((ox - COORD(x)) <= TILE_SIZE) &&

+        y >= 0 && y < ds->order && ((oy - COORD(y)) <= TILE_SIZE)) {

         if (button == LEFT_BUTTON) {

             /* normal highlighting for non-immutable squares */

             if (GRID(state, flags, x, y) & F_IMMUTABLE)