From 4e3721325d553bde976adbb7e16dca94e9ed9dd1 Mon Sep 17 00:00:00 2001
From: John Bauer <horatio@gmail.com>
Date: Thu, 12 Oct 2023 21:32:37 -0700
Subject: [PATCH] Need to compare EmptyIndex as well when looking at isCopy

---
 src/edu/stanford/nlp/ling/IndexedWord.java | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/edu/stanford/nlp/ling/IndexedWord.java b/src/edu/stanford/nlp/ling/IndexedWord.java
index 0747e6772d..6f2fffa6b8 100644
--- a/src/edu/stanford/nlp/ling/IndexedWord.java
+++ b/src/edu/stanford/nlp/ling/IndexedWord.java
@@ -402,6 +402,13 @@ public boolean isCopy(IndexedWord otherWord) {
       return false;
     }
 
+    // compare empty word index
+    Integer myEmptyIndex = get(CoreAnnotations.EmptyIndexAnnotation.class);
+    Integer otherEmptyIndex = otherWord.get(CoreAnnotations.EmptyIndexAnnotation.class);
+    if ( ! Objects.equals(myEmptyIndex, otherEmptyIndex)) {
+      return false;
+    }
+
     if (copyCount() == 0 || otherWord.copyCount() != 0) {
       return false;
     }