From 25dc8c3518b5e1c71f3d01f991bea51efc37599a Mon Sep 17 00:00:00 2001
From: Ryan Schultz <ryan@openingdesign.com>
Date: Thu, 2 Apr 2026 10:56:56 -0500
Subject: [PATCH] Fix TypeError in ray_cast_by_proximity_2d degenerate edge

A degenerate edge (zero-length segment) caused an early `return`
of a tuple instead of continuing the loop, resulting in a
TypeError when snap.py iterated the result and tried to assign
`point["group"]` on a float.

Generated with the assistance of an AI coding tool.
---
 src/bonsai/bonsai/tool/raycast.py | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/src/bonsai/bonsai/tool/raycast.py b/src/bonsai/bonsai/tool/raycast.py
index c16bc55564..6b613aecaf 100644
--- a/src/bonsai/bonsai/tool/raycast.py
+++ b/src/bonsai/bonsai/tool/raycast.py
@@ -434,11 +434,8 @@ class Raycast(bonsai.core.tool.Raycast):
             seg_len_sq = sx * sx + sy * sy
 
             if seg_len_sq == 0.0:
-                # degenerate segment: return distance to p0
-                dx = px - p0x
-                dy = py - p0y
-                dist = math.hypot(dx, dy)
-                return dist, (p0x, p0y), 0.0
+                # degenerate segment: skip it
+                continue
 
             # project (p - p0) onto seg: t = dot(p-p0, seg) / |seg|^2
             apx = px - p0x