Query: Ignore search terms consisting of a single dash.

Due to the "exclude" support added in WP 4.4, single dashes were being
converted to "NOT LIKE '%%'" clauses, causing all searches to fail.

Props RomSocial, swissspidy.
Fixes #36195.
Built from https://develop.svn.wordpress.org/trunk@36989


git-svn-id: http://core.svn.wordpress.org/trunk@36956 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/query.php

@@ -2194,8 +2194,8 @@ class WP_Query {
 			else
 				$term = trim( $term, "\"' " );
 
-			// Avoid single A-Z.
-			if ( ! $term || ( 1 === strlen( $term ) && preg_match( '/^[a-z]$/i', $term ) ) )
+			// Avoid single A-Z and single dashes.
+			if ( ! $term || ( 1 === strlen( $term ) && preg_match( '/^[a-z\-]$/i', $term ) ) )
 				continue;
 
 			if ( in_array( call_user_func( $strtolower, $term ), $stopwords, true ) )

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.5-beta3-36988';
+$wp_version = '4.5-beta3-36989';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.