List block: when removing an empty list item, should not merge two list items

[v18]

Describe the bug
When I press the 'delete' key on an empty list item, the item below the empty one gets merged with the one above.

A gif demo:

To Reproduce
Steps to reproduce the behavior:

1. Make a new list gutenberg block
2. Add some items
3. Make one of the items empty (no text, but still with a number / bullet)
4. Put cursor at the empty list item
5. Press 'delete' on your keyboard
6. See the two items around the empty list item merged

Expected behavior

Starting from this list:

1. Apples
2. Oranges
3. 
4. Limes
5. Lemons

I expected to see this after pressing 'delete' on item 3:

1. Apples
2. Oranges
4. Limes
5. Lemons

[designsimply]

Tested and confirmed that deleting an empty list item merges the list items before and after it using WordPress 4.9.8 and Gutenberg 4.5.1 master @ e4fd51cb5 using Firefox 63.0.3 on macOS 10.13.6.

[ellatrix]

Thanks for the report!

[ZebulanStanphill]

I can confirm this is still happening in Gutenberg 4.6.1.

[youknowriad]

I can't reproduce, I suppose it was fixed by #13697

[ellatrix]

Thanks for testing. Yes, I think it was TinyMCE and RichText both acting at the same time.