From 2d888817e84e2b76f113bb0d7df6be397da45f6d Mon Sep 17 00:00:00 2001
From: Zicklag <zicklag@katharostech.com>
Date: Sat, 9 Apr 2022 13:52:19 -0500
Subject: [PATCH] Fix Subtraction Overflow In Map Editor

---
 src/editor/tools/placement.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/editor/tools/placement.rs b/src/editor/tools/placement.rs
index 843ea90afa..c397527dd8 100644
--- a/src/editor/tools/placement.rs
+++ b/src/editor/tools/placement.rs
@@ -86,7 +86,11 @@ impl EditorTool for TilePlacementTool {
                         for x in 0..3 {
                             if let Some(layer) = &ctx.selected_layer {
                                 let is_some = map
-                                    .get_tile(layer, coords.x + x - 1, coords.y + y - 1)
+                                    .get_tile(
+                                        layer,
+                                        (coords.x + x).saturating_sub(1),
+                                        (coords.y + y).saturating_sub(1),
+                                    )
                                     .is_some();
                                 surrounding_tiles.push(is_some);
                             }