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Changes between Initial Version and Version 1 of Ticket #25856, comment 18

initial	v1
8	8	- The part `preg_replace('!(<' . $allblocks . '[^>]*\/>)!i', "$1\n\n"...` is not needed. As far as I know there aren't any block elements in HTML 5.0 that don't require a closing tag.
9	9	- Not sure which tags `preg_match( '/<p[^>]>.?<\/p[^>]*>/si'...` is supposed to match. Currently it matches `<p>\|<pre>\|<param>\|<progress>`. Doesn't look like this was intended. If we need only `<p>`, the start of the regex would be `/<p(?: [^>]+)?>...`, not sure why the closing tag is expanded.
	10	- On the same line: the `preg_match( '/<' . $allblocks .'[^>]*\/>/si'...` doesn't make sense. See the first point.
10	11	- Don't see a point in preserving formatting/line breaks in `<audio>`, `<video>` and `<object>`. The only HTML tag where this matters is `<pre>`. All line breaks in the other tags should probably be stripped, saving some processing time. Further, this will fail for `<object>` as it can be nested and often is.
11	12