From af1d1e7c995d42e7ba1852873187b70158fedfd7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mafalda=20Ram=C3=B4a?=
 <74077940+mafaldaramoa@users.noreply.github.com>
Date: Thu, 30 Mar 2023 16:12:14 +0100
Subject: [PATCH] Fix gflow

Changed the gflow function to prevent it from returning a gflow if any vertices outside of boundary type inputs remain unprocessed in the end. Should solve issue #114
---
 pyzx/gflow.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pyzx/gflow.py b/pyzx/gflow.py
index 6fb6b172..d8956c54 100644
--- a/pyzx/gflow.py
+++ b/pyzx/gflow.py
@@ -109,7 +109,7 @@ def gflow(
                 l[u] = k
 
         if not correct:
-            if not candidates:
+            if vertices.difference(processed) == inputs.difference(pattern_inputs):
                 return l, gflow, k
             return None
         else: