Editor crashes when Post edit block selected with other blocks

[bobbingwide]

When I was attempting Call #7: Polished portfolios I experienced the Editor crashing.

I documented this at https://sneak-peek.me/2021/06/11/call-7-polished-portfolios/

The problem occurs when the Post Edit block is selected as part of multiple block selection.

3 blocks selected

Attempting to select the Post Edit block leads to

The error is

TypeError: Cannot read property 'lastChild' of null
    at np (https://sneak-peek.me/wp-content/plugins/gutenberg/build/block-editor/index.js?ver=88d0ba7a6e6f356fbb72073b72436b2a:81:22824)
    at https://sneak-peek.me/wp-content/plugins/gutenberg/build/block-editor/index.js?ver=88d0ba7a6e6f356fbb72073b72436b2a:81:23828
    at Bh (https://sneak-peek.me/wp-content/plugins/gutenberg/vendor/react-dom.min.de439aae.js:126:456)
    at Dj (https://sneak-peek.me/wp-content/plugins/gutenberg/vendor/react-dom.min.de439aae.js:162:476)
    at unstable_runWithPriority (https://sneak-peek.me/wp-content/plugins/gutenberg/vendor/react.min.e713ea3b.js:25:260)
    at Da (https://sneak-peek.me/wp-content/plugins/gutenberg/vendor/react-dom.min.de439aae.js:60:280)
    at xb (https://sneak-peek.me/wp-content/plugins/gutenberg/vendor/react-dom.min.de439aae.js:162:231)
    at Te (https://sneak-peek.me/wp-content/plugins/gutenberg/vendor/react-dom.min.de439aae.js:146:79)
    at https://sneak-peek.me/wp-content/plugins/gutenberg/vendor/react-dom.min.de439aae.js:61:68
    at unstable_runWithPriority (https://sneak-peek.me/wp-content/plugins/gutenberg/vendor/react.min.e713ea3b.js:25:260)

Note: The Post edit block is almost impossible to select in the block editor anyway.
So something needs to be changed. Maybe whatever's necessary to make the block selectable will solve the problem.
Perhaps just allowing the user to define the (Edit) string will be enough.

[bobbingwide]

Proposed solution

• Allow the (Edit) label for the link to. Be editable.
• Add block supports values similar to the Post Date block: align, typography
• Eliminate Server Side Rendering code when in the editor. Can the save method be removed completely?
• Update SSR to support label and alignment settings.

[bobbingwide]

In this screen capture, the 3 blocks selected are:

1. The group block containing featured image, title and post date
2. The Post edit block
3. The spacer that follows

The Post edit block is styled with align center, link colour white and background black.

[bobbingwide]

This is now fixed in v0.1.0.
Need to upload to sneak-peek.me and test.

[bobbingwide]

I haven't uploaded the block to sneak-peek.me. It now appears that the block doesn't work in s.b/wp55/thisis
I don't yet have a clue why not.

[bobbingwide]

I haven't uploaded the block to sneak-peek.me. It now appears that the block doesn't work in s.b/wp55/thisis
I don't yet have a clue why not.

I belive the problem is explained by my investigation in bobbingwide/thisis#34

Proposed solution

Apply the workaround suggested, and retest in s.b/wp55/thisis and sneak-peek.me

[bobbingwide]

Apply the workaround suggested, and retest in s.b/wp55/thisis

I retested in https://s.b/wp55/thisis/2021/06/13/post-edit-block/, logged in and out, with and without the workaround.

[bobbingwide]

I retested in https://sneak-peek.me/2021/06/13/post-edit-block/
After noting that the casual visitor won't actually see the link I updated the post to include the screenshot for the plugin.