From 2f10f6fbe1b5e5fbf9e605e96cebd649ff019950 Mon Sep 17 00:00:00 2001
From: Ken Hoover <k.hoover3@gmail.com>
Date: Mon, 28 Oct 2024 23:47:13 -0700
Subject: [PATCH] fix: Fix wrapping arithmetic for overflowing_add.

---
 src/local/room_coordinate.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/local/room_coordinate.rs b/src/local/room_coordinate.rs
index 94b2e959..51dc66b2 100644
--- a/src/local/room_coordinate.rs
+++ b/src/local/room_coordinate.rs
@@ -463,13 +463,14 @@ impl RoomOffset {
     /// );
     /// ```
     pub fn overflowing_add(self, rhs: Self) -> (Self, bool) {
+        const RANGE_WIDTH: i8 = 2 * ROOM_SIZE_I8 - 1;
         self.assume_bounds_constraint();
         rhs.assume_bounds_constraint();
         let raw = self.0 + rhs.0;
         if raw <= -ROOM_SIZE_I8 {
-            (Self::new(raw + ROOM_SIZE_I8).unwrap_throw(), true)
+            (Self::new(raw + RANGE_WIDTH).unwrap_throw(), true)
         } else if raw >= ROOM_SIZE_I8 {
-            (Self::new(raw - ROOM_SIZE_I8).unwrap_throw(), true)
+            (Self::new(raw - RANGE_WIDTH).unwrap_throw(), true)
         } else {
             (Self::new(raw).unwrap_throw(), false)
         }