Undefined indexes for $redirect and $original in redirect_canonical

[minddog]

To reproduce do a fresh install of wordpress and turn on debug mode. Visit the homepage and you'll see the notices.

Notice: Undefined index: port in <removed>/wp-includes/canonical.php on line 181
Notice: Undefined index: query in <removed>/wp-includes/canonical.php on line 181
Notice: Undefined index: port in <removed>/wp-includes/canonical.php on line 181
Notice: Undefined index: query in <removed>/wp-includes/canonical.php on line 181

To fix this issue, I think we can ignore any extraneous initialization code and suppress the notices with @, as the operation array() !== array() is not affected undefined indexes internally.

Please see my patch for fixing this issue, thanks.

[filosofo]

Already been fixed.

Trac ticket: Core-61646

Previously, the html5lib tests have only run in the fragment parser mode, but in #6977 a full parser was introduced to the HTML API. In this patch, the html5lib tests are running in the full parser mode where applicable.

- Tests: 609, Assertions: 405, Skipped: 204.
+ Tests: 1486, Assertions: 716, Skipped: 770.

@sirreal I've added active format reconstruction to the PLAINTEXT element, even though it's missing from the spec, but all the major parsers clearly perform this. I've submitted a PR to the HTML spec to add the rule.

​https://github.com/whatwg/html/pull/10540

Leaving a note for posterity's sake: adding active format reconstruction to PLAINTEXT is wrong. Adding PLAINTEXT is more complicated than it originally seemed, because even though every remaining token is a character token, if there are any character tokens left, they may trigger active format reconstruction. This is something I'll try and fix

Fragment support extracted into ​https://github.com/WordPress/wordpress-develop/pull/7141 where I thought I had already done so, sorry!

Thanks, I'll revert the changes to support arbitrary fragments here and continue to only support body. That work is more complicated and can continue in #7141.

Merged in [58859]
​https://github.com/wordpress/wordpress-develop/commit/9928cd6bcb35d14a700e3930355b6703f0cb4dc8