Proposal: Add snackbar notification when unlocking content only blocks

[richtabor]

Perhaps there is a persistent snackbar that renders when you opt to unlock a content-only locked block.

This would allow you to easily re-lock a temporarily unlocked block, instead of having to find the "Done" control on the parent locked block. I'd expect that selecting "Done" in the block toolbar of the parent block would dismiss the snackbar, and clicking the "Lock" call the action would re-lock the block and dismiss the snackbar.

Perhaps the copy needs refinement, but I think it's an interesting approach to be able to easily re-lock a recently unlocked content-only block.

I thought of this while reviewing #61127.

[kevin940726]

I don't think there's a way to add persistent snackbars for now, so that will have to be implemented separately. Do you think it's still worth it when the snackbar automatically dismisses itself after a timeout?

[talldan]

Two things I've been thinking about in relation to this:

• How does it work when there's a persistent snackbar and a non-persistent snackbar at the same time? It might be a simple thing, but I'm trying to imagine it right now 😄
• The action buttons that appear in a snackbar is probably more of an affordance for mouse/trackpad users, I'm not sure whether users that rely on keyboard input primarily could navigate to it (in my testing I couldn't find a way). I guess the point I'm making here is that the snackbar action has never been considered the primary way to achieve something, more of a secondary convenience. It might be possible to make it a 'navigable region' or implement a shortcut to get into the snackbar list, and when focus is inside a snackbar maybe freeze them so they don't disappear. Discoverability is another matter (though it's a major issue with the current UI too).

[kevin940726]

There's also a notice style which seems more like a prompt message.

I guess this is only meant to be a secondary way to access the "Done" action in the block toolbar after all, so either UI should help. A better UX can be redesigned in the future. We just want to make sure that the advantages outweigh the disadvantages.

[kevin940726]

I opened #61845 to help testing and figure out a better UX.