Size Change: +70 B (0%)

Total Size: 1.15 MB

_{compressed-size-action}

Thank you for working on this!

In this branch, as I hover a block in the block library, I'm getting a full on crash with the following error message:

TypeError: Cannot read property 'offsetWidth' of null
    at InsertionPoint (http://localhost:8889/wp-content/plugins/gutenberg/build/block-editor/index.js?ver=edf4ad2a28fcfd574858720b31223716:14588:30)
    at renderWithHooks (http://localhost:8889/wp-includes/js/dist/vendor/react-dom.js?ver=16.9.0:15246:18)
    at updateFunctionComponent (http://localhost:8889/wp-includes/js/dist/vendor/react-dom.js?ver=16.9.0:17063:20)
    at beginWork$1 (http://localhost:8889/wp-includes/js/dist/vendor/react-dom.js?ver=16.9.0:18636:16)
    at HTMLUnknownElement.callCallback (http://localhost:8889/wp-includes/js/dist/vendor/react-dom.js?ver=16.9.0:341:14)
    at Object.invokeGuardedCallbackDev (http://localhost:8889/wp-includes/js/dist/vendor/react-dom.js?ver=16.9.0:391:16)
    at invokeGuardedCallback (http://localhost:8889/wp-includes/js/dist/vendor/react-dom.js?ver=16.9.0:448:31)
    at beginWork$$1 (http://localhost:8889/wp-includes/js/dist/vendor/react-dom.js?ver=16.9.0:23355:7)
    at performUnitOfWork (http://localhost:8889/wp-includes/js/dist/vendor/react-dom.js?ver=16.9.0:22346:12)
    at workLoopSync (http://localhost:8889/wp-includes/js/dist/vendor/react-dom.js?ver=16.9.0:22323:22)

I'm not sure it's related, but it might be related to #20713, which is pending a fix.

By the way the blue line that shows up should look identical to the one that appears when you drag an image from the desktop:

It may already do that, I haven't been able to verify :D but just noting!

Thanks so much for working on this. I'm still getting that same React error when hovering a block as I mentioned in #20792 (comment). Not sure if I did it wrong, but I had to check out using git checkout --track origin/fix/inserter-line.

By the way can you make it so that the line is visible as soon as you open the top left inserter? Not just on block hover, but all the time when it's open?

I've been trying to fix this problem but I get stuck with getBlockInsertionPoint() constantly returning different values:

This value just changes all the time when hovering around in the inserter... Also not sure why blocks are being reset and if that's maybe the cause.

AH, I just realised there's logging because there's a preview creating another block list with its own insertion point etc.