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Handle replacing an existing arrow

--- a/galaxies.c

+++ b/galaxies.c

@@ -373,7 +373,9 @@

     }

     sfree(colors);

+    remove_assoc_with_opposite(state, tile);

     add_assoc(state, tile, dot);

+    remove_assoc_with_opposite(state, opposite);

     add_assoc(state, opposite, dot);

 }

@@ -2589,7 +2591,7 @@

         if (INUI(state, px, py)) {

             sp = &SPACE(state, px, py);

-            if (!(sp->flags & F_DOT) && !(sp->flags & F_TILE_ASSOC))

+            if (!(sp->flags & F_DOT))

 		sprintf(buf + strlen(buf), "%sA%d,%d,%d,%d",

 			sep, px, py, ui->dotx, ui->doty);

 	}