TileMap: Fix floor precision in world_to_map on tile borders

Fixes #23250, supersedes #23315.

1 files changed, 5 insertions, 0 deletions

diff --git a/scene/2d/tile_map.cpp b/scene/2d/tile_map.cpp
index 67e25ec508..a7ac2bb982 100644
--- a/scene/2d/tile_map.cpp
+++ b/scene/2d/tile_map.cpp
@@ -1445,6 +1445,11 @@ Vector2 TileMap::world_to_map(const Vector2 &p_pos) const {
 		default: {}
 	}
 
+	// Account for precision errors on the border (GH-23250).
+	// 0.00005 is 5*CMP_EPSILON, results would start being unpredictible if
+	// cell size is > 15,000, but we can hardly have more precision anyway with
+	// floating point.
+	ret += Vector2(0.00005, 0.00005);
 	return ret.floor();
 }