Regression: Shortcuts menu flickers when the page is loaded

Ten bucks says this is caused by BigPipe injecting the data. Should be able to be fixed with https://www.drupal.org/node/3338948 with a similar technique as #3441137: BigPipe injecting Local Actions block creates large janky layout shift in Claro

Confirmed that it is BigPipe. Everyone now owes me $10.

This isn't a beta-blocker, so let's fix this after it gets into core (which should be very soon).

Thank you for being able to capture the glitch!

For reference: This flickering was introduced as part of this comment in the main core
MR:https://git.drupalcode.org/project/drupal/-/merge_requests/7474#note_297577

Need to find a way to have a cacheable placeholder to avoid flickering.

It affects to user navigation block as well, but it's less noticeable, given that's in the footer.

We could consider this a duplicated of #3443452: [PP-1] User menu block render array is cached per user or vice-versa.

I'm working on this ticket as part of the Drupal2024 First Time Contributor workshop and am mentoring a few people who will say hello below!

We're going to be reviewing this patch.

I will be taking a look at this.

Hello,
I am going to be testing on this issue!

-Sara

Thank fo fix. One suggestion added

@finnsky Good call! Fixed and ready for review.

Yay, no any flickering in menu anymore. Thank you!

Committed and pushed c0beeeea5f to 11.x and 6974f8b7f0 to 11.0.x and 04fad10830 to 10.4.x and 2237b2eed8 to 10.3.x. Thanks!