Account for different references when collapsing footnotes.

src/Plugin/Filter/ReferenceFootnotesFilter.php

@@ -184,6 +184,8 @@ class ReferenceFootnotesFilter extends FootnotesFilter {
     $randstr = $this->randstr();
 
     $value = $this->extractAttribute($matches, 'value');
+    $page = $this->extractAttribute($matches, 'page');
+    $reference = $this->extractAttribute($matches, 'reference');
 
     if ($value) {
       // A value label was found. If it is numeric, record it in $n so further
@@ -195,7 +197,7 @@ class ReferenceFootnotesFilter extends FootnotesFilter {
         $n = $value;
       }
     }
-    elseif ($opt_collapse and $value_existing = $this->findFootnote($matches[2], $store_matches)) {
+    elseif ($opt_collapse and $value_existing = $this->findFootnote($matches[2], $reference, $store_matches)) {
       // An identical footnote already exists. Set value to the previously
       // existing value.
       $value = $value_existing;
@@ -211,8 +213,6 @@ class ReferenceFootnotesFilter extends FootnotesFilter {
     // attribute.
     $value_id = preg_replace('|[^\w\-]|', '', $value);
 
-    $page = $this->extractAttribute($matches, 'page');
-    $reference = $this->extractAttribute($matches, 'reference');
 
     // Create a sanitized version of $text that is suitable for using as HTML
     // attribute value. (In particular, as the title attribute to the footnote
@@ -279,10 +279,10 @@ class ReferenceFootnotesFilter extends FootnotesFilter {
   /**
    * @inheritdoc
    */
-  private function findFootnote($text, &$store_matches) {
+  private function findFootnote($text, $reference, &$store_matches) {
     if (!empty($store_matches)) {
       foreach ($store_matches as &$fn) {
-        if ($fn['text'] == $text) {
+        if ($fn['text'] == $text && $fn['reference'] == $reference) {
           return $fn['value'];
         }
       }