Consolidate handling of object, audio and video tags in wpautop

[azaozz]

There is some code in both JS and PHP flavors of wpautop() that strips line breaks from inside <object> tags to prevent <br> and <p>. Something similar is needed for <audio> and <video>.

The general idea is to prevent <param>, <embed>, <track>, <source>, etc. from being wrapped in <p> without treating them as "block" elements.

[azaozz]

Patch by wonderboymusic

[azaozz]

Related: #26628. 26864.patch contains the wpautop() parts from 26628.5.diff.

[azaozz]

References: ​<object>, ​<audio>, ​<video>.

[azaozz]

In 26864.2.patch:

• Prevent <p> and <br> around <source> and <track> in wpautop.
• Add a few unit tests.

[azaozz]

In 26864.3.patch:

• Run the wpautop() regex only when <source> or <track> tags are present.
• Test for running wpautop() from wp_richedit_pre().

[azaozz]

In 27094:

Consolidate handling of <object>, <audio> and <video> in wpautop() and add unit tests for them. Part props wonderboymusic, see #26864

[wonderboymusic]

Boom.

[wonderboymusic]

In 27096:

The video shortcode unit test shouldn't be expected to maintain HTML comments.

See #26864.

[helen]

What else do we need here?

[nacin]

Seems like this has been holding up nicely.