BUG+FIX: attachments not imported due to cached filesize()

On my system WordPress importer correctly downloads attachments (images) and than during various filesize checks (in function fetch_remote_file) deletes them and throws an error, because PHP returns cached size equal to 0.

Quick fix, is to call clearstatcache() before doing filesize(). For prod maybe optimize it a bit, this is quick hot fix ??

This problem seems to be more common, according to some posts in this forum.

--- wordpress-importer.php-old  2019-03-30 23:07:17.958996314 +0000
+++ wordpress-importer.php      2019-03-30 23:07:13.787066903 +0000
@@ -1011,6 +1011,7 @@
                        return new WP_Error( 'import_file_error', sprintf( __('Remote server returned error response %1$d %2$s', 'wordpress-importer'), esc_html($remote_response_code), get_status_header_desc($remote_response_code) ) );
                }

+               clearstatcache();
                $filesize = filesize( $upload['file'] );

                if ( isset( $headers['content-length'] ) && $filesize != $headers['content-length'] ) {