Typo in comments reply observer, new comments don't get events attached

[maguiar]

There's a typo in the comment's reply link observer. It's supposed to observe DOM changes inside body so it can attach the reply link event to new nodes. However, Core has it written as:

var observerOptions = {
    childList: true,
    subTree: true
};

subTree should be subtree. Because of this new comments added with ajax don't get the event attached to them, and the reply link directs instead to whatever the reply link points to. While the rest of comments open the reply form below the comment.

[maguiar]

For reference, here's the subtree documentation: ​https://developer.mozilla.org/en-US/docs/Web/API/MutationObserverInit/subtree

[maguiar]

Typo fix

[SergeyBiryukov]

Hi @maguiar, welcome to WordPress Trac! Thanks for the ticket and the patch.

Introduced in [44748].

[SergeyBiryukov]

In 45641:

Comments: Fix typo in comment reply observer options.

Props maguiar.
Fixes #47706. See #46260.