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Proof of concept: No in-canvas appender. #31886

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jasmussen
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Don't merge this, it's purely a proof of concept. The goal of this is to explore alternatives to the current in-canvas appender — the black plus — which causes a big layout shift when appearing:

yes appender

This PR simply forces that black plus to never be shown, eliminating that layout shift entirely:

no appender

This PR is not meant to be merged as is, it's only meant to explore a new baseline of no layout shift ever. In that vein, this is already wildly successful, especially in the site editor:

site editor

Here's before 🙈:

before

A few take-aways that are immediately evident:

  • Don't underestimate the value of zero layout shift.
  • We do need a way to insert blocks in nesting containers. That can potentially be a more discoverable sibling inserter, or something else.
  • Which ever it is, it will be in a popover, which means it won't be subject to CSS bleed from the theme. That's another benefit.

@jasmussen jasmussen added the [Status] In Progress Tracking issues with work in progress label May 17, 2021
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Size Change: +3 B (0%)

Total Size: 1.3 MB

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@jameskoster
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Yeah this feels infinitely better 🤩

We do need a way to insert blocks in nesting containers. That can potentially be a more discoverable sibling inserter, or something else.

I don't think it's too bad, even as it stands. The social links block is a more trying example due to the size, but even that is still quite easy to use imo:

Screenshot 2021-05-17 at 12 59 19

We would need to figure out empty containers though:

Screenshot 2021-05-17 at 13 02 06

@ZebulanStanphill
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ZebulanStanphill commented May 17, 2021

I think empty containers are one of the few places where it makes sense to break the look-like-the-front-end rule. Usually, a container is meant to, well, contain something, so an empty one could almost always be considered to be in a sort of unfinished/placeholder state. There may be some blocks where this is not the case, but I can't think of any off the top of my head.

Essentially, I figure that every empty container block should probably look similar to how an empty Group block looks, or else have some unique placeholder like the Navigation block.

@jasmussen
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Since this one was only ever meant as an experiment (and can still be checked out even if closed, right?) — I'll close this one.

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