Rewrite Rules rebuilding on parse_request

[andyphillips82]

Hi,

We have an issue that when flush_rewrite_rules is flushing, another request is coming in an parse_request is firing. While update_option('rewrite_rules', ' ') is deleted and the rules are being processed, parse_request is passing the conditional and writing it's own rules.

I've created a patch that has flush_rewrite_rules being solely responsible for rebuilding the rewrite rules. Otherwise, parse request will just read the current rules.

[andyphillips82]

allo?