Index: core/modules/views/src/Plugin/views/HandlerBase.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/core/modules/views/src/Plugin/views/HandlerBase.php b/core/modules/views/src/Plugin/views/HandlerBase.php
--- a/core/modules/views/src/Plugin/views/HandlerBase.php	(revision 065d314c04e977a82edff34d303089ec53b7b84c)
+++ b/core/modules/views/src/Plugin/views/HandlerBase.php	(revision 4438329da4bc775afcfec50114a1b91f320f708f)
@@ -731,7 +731,7 @@
     if (preg_match('/^([\w0-9-_\.]+[+ ]+)+[\w0-9-_\.]+$/u', $str)) {
       // The '+' character in a query string may be parsed as ' '.
       $operator = 'or';
-      $value = preg_split('/[+ ]/', $str);
+      $value = explode('+', $str);
     }
     elseif (preg_match('/^([\w0-9-_\.]+[, ]+)*[\w0-9-_\.]+$/u', $str)) {
       $operator = 'and';