From 551c3ccd2f58f353a2535aa824072161558cda4b Mon Sep 17 00:00:00 2001
From: Alexander O'Neill <aoneill@upei.ca>
Date: Tue, 26 Oct 2021 15:50:47 -0300
Subject: [PATCH] Properly check for collapsed notes option.

---
 src/Plugin/Filter/ReferenceFootnotesFilter.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Plugin/Filter/ReferenceFootnotesFilter.php b/src/Plugin/Filter/ReferenceFootnotesFilter.php
index 639ecd0..283c546 100644
--- a/src/Plugin/Filter/ReferenceFootnotesFilter.php
+++ b/src/Plugin/Filter/ReferenceFootnotesFilter.php
@@ -129,7 +129,7 @@ class ReferenceFootnotesFilter extends FilterBase {
     if ($op == 'prepare') {
       // In the 'prepare' case, the first argument contains the options to use.
       // The name 'matches' is incorrect, we just use the variable anyway.
-      $opt_collapse = $matches;
+      $opt_collapse = isset($matches['footnotes_collapse']) && $matches['footnotes_collapse'];
       return 0;
     }