oEmbed with many <pre> tags do not work

[jagszent]

If an oEmbed has more than ten <pre> tags WP_oEmbed::_strip_newlines (called by oembed_dataparse} filter) returns a wrong result for it.

All <pre> tags get temporarily replaced by a token, the newline stripping gets done and then the tokens <pre> get replaced back to their HTML. The tokens unfortunately are just __PRE__ plus a counter (e.g. __PRE__0, __PRE__1) Thus if there are more than ten <pre> tags there will be tokens like __PRE__10. These obviously clash with previous tokens.

Granted, this is quite uncommon but nonetheless it should be fixed in my opinion.

[jagszent]

Possible fix #1

[jagszent]

Possible fix #2