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Distinguish MOVE_UNUSED from MOVE_NO_EFFECT in Untangle

--- a/untangle.c

+++ b/untangle.c

@@ -1210,7 +1210,7 @@

             place_dragged_point(state, ui, ds, x, y);

 	    return MOVE_UI_UPDATE;

 	}

-

+        return MOVE_NO_EFFECT;

     } else if (IS_MOUSE_DRAG(button) && ui->dragpoint >= 0) {

         place_dragged_point(state, ui, ds, x, y);

 	return MOVE_UI_UPDATE;

@@ -1238,9 +1238,10 @@

 		ui->newpoint.x, ui->newpoint.y, ui->newpoint.d);

 	ui->just_dragged = true;

 	return dupstr(buf);

-    }

+    } else if (IS_MOUSE_DRAG(button) || IS_MOUSE_RELEASE(button))

+        return MOVE_NO_EFFECT;

-    return NULL;

+    return MOVE_UNUSED;

 }

 static game_state *execute_move(const game_state *state, const char *move)