Rewrite/Permalinks/Canonical: in `url_to_postid()`, call `set_url_scheme()` on the URL to combat mixed content issues and find posts cross-scheme.

Adds unit tests.

Props swissspidy.
Fixes #34144.

Built from https://develop.svn.wordpress.org/trunk@34890


git-svn-id: http://core.svn.wordpress.org/trunk@34855 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/rewrite-functions.php

@@ -339,6 +339,9 @@ function url_to_postid( $url ) {
 	$url_split = explode('?', $url);
 	$url = $url_split[0];
 
+	// Set the correct URL scheme.
+	$url = set_url_scheme( $url );
+
 	// Add 'www.' if it is absent and should be there
 	if ( false !== strpos(home_url(), '://www.') && false === strpos($url, '://www.') )
 		$url = str_replace('://', '://www.', $url);

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34889';
+$wp_version = '4.4-alpha-34890';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.