Ticket #47594: 47594.1.diff

src/wp-includes/formatting.php

@@ -2173 +2173 @@
         $raw_title = $title;
 
         if ( 'save' === $context ) {
+
+                // Change space characters in unicode to the corresponding html entity.
+                $title = str_replace(
+                        array(
+                                '%e2%80%af',
+                                '%e2%80%87',
+                                '%e2%81%a0',
+                                ' ',
+                                ' ',
+                                ' ',
+                                ' ',
+                                '⁠',
+                                '⁠',
+                        ),
+                        ' ',
+                        $title
+                );
+
                 $title = remove_accents( $title );
         }