IE11 Undefined reference when creating empty block in page

[bookdude13]

Using IE 11 (dev build off of trunk).
When creating a new post, if the cursor is in an empty block and you click enter, a new block is created underneath (normal behavior). This triggers an error in the console - "Impossible to obtain the property 'contains' on a null or undefined reference" in block-editor.js, line 16196:

6194   key: "isSelectionEligibleForScroll",
6195       value: function isSelectionEligibleForScroll() {
6196         return this.props.selectedBlockClientId && this.ref.current.contains(document.activeElement) && document.activeElement.isContentEditable;
6197       }

[afercia]

I was able to reproduce this and determine it's a regression in trunk. Testing on WordPress 5.3.2 I get other errors, but not this one.

[aduth]

A fix is proposed in the Gutenberg, and could be cherry-picked as a bug fix for WordPress 5.4 once merged:

​https://github.com/WordPress/gutenberg/pull/20485

Edit: The pull request has since been merged and should be included as part of the cherry-picked changes for Monday's 5.4-RC1.

[jorgefilipecosta]

Closing this ticket as ​https://github.com/WordPress/gutenberg/pull/20485 is already part of WordPress 5.4.