Backport change.

[spacedmonkey]

Trac ticket: https://core.trac.wordpress.org/ticket/58231

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This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.

[oandregal]

I see this backports WordPress/gutenberg#47833 and WordPress/gutenberg#48759 Noting so we don't forget linking this to the original gutenberg PRs and the props to t-hamano.

I also see that there is a related ticket https://core.trac.wordpress.org/ticket/58193 and that Felix mentioned he'll work on backporting everything WordPress/gutenberg#47833 (comment)

Changes seem fine to me, though.

[oandregal]

There is no process for backports, it changes from person to person. I can share what I do when I backport and what I find helpful:

• Link to all the Gutenberg PRs that are backported in the PR description (in addition to the trac ticket).
• Link to the backport PR in the original Gutenberg PRs: Performance improvements on append_to_selector method gutenberg#47833 (comment) and Fix: Incorrect selector generated by append_to_selector method gutenberg#48759 (comment)

Not that this is mandatory in any way, though I've found it very helpful.

[joemcgill]

The approach seems good to me, and given that this is already been in Gutenberg for a while should be fine to commit.

[tellthemachines]

Hi! To confirm, this is meant to be a separate piece from #4380?

I added this PR to the 6.3 board, please feel free to move it to "needs core commit" if it's good to go!

[spacedmonkey]

Committed. https://core.trac.wordpress.org/changeset/55907

[spacedmonkey]

Hi! To confirm, this is meant to be a separate piece from #4380?

I added this PR to the 6.3 board, please feel free to move it to "needs core commit" if it's good to go!

@tellthemachines I committed as I wanted to unblock my ticket. Let's backport that separately.

[tellthemachines]

Thanks @spacedmonkey !