wptexturize ignores text after unmatched [

[miqrogroove]

In handling the element and shortcode delimeters to avoid changing their contents, the function rather lazily ignores everything after the first char of the post or split phrase. You can try these in the editor with the preview button.

Test case:

[Hello world, this is my post.  "As you may know, I like curly quotes."

Compare with:

H[ello world, this is my post.  "As you may know, I like curly quotes."

[miqrogroove]

Patch added on #12690. These are two different bugs but should be fixed together.

[wonderboymusic]

In 28727:

In wptexturize(), ensure that texturization does not corrupt contents of HTML elements, HTML comments, and smartcode attributes.

Adds a variety of unit tests/assertions.

Props miqrogroove.
Fixes #12690, #8912, #27602.