Description

This was observed for few months, not only on recent Gutenberg versions.
I use the buttons of the floated toolbar to indent my lists.

1/ When we write down a quite long (normal) content, the typing become slower and slower
My example is a content with those figures, i make usage of many nested lists into my paragraphs.

• Characters:12463
• Words:1923

<!>I observe this mostly on Firefox, less on Chrome but is occurs on both browsers after few minutes at editing your article

2/ Manage List entries generate flickering / flackiness

If you have a list and sublists, it's extremely difficult to update the sublists. Adding some, delete empty sublists, etc.

* list 1
   * sublist 1-1
       * sub-sublist 1-1-1
       * sub-sublist 1-1-2
   * sublist 1-2
   * sublist 1-3
* list 2
   * sublist 2-1
   * sublist 2-2
   * sublist 2-3

Several cases here :

• [a] When deleting a sublist, for instance 1-2, it impacts the next the next List2 that is sometimes merged into List 1 ! Sublist 1-3 can disapear. It is a nightmare.
• [b] Sometimes, when inserting a sublist betweeen two already sublists, the content of the next sublists are superposed (character becomes non readable). The only way to make this disappear is to save + refresh the page
• [c] When you want to delete an empty list, you hit Delete on your keyboard but it deletes the next sublists, you loose content !

<!> I observe these behaviors in Chrome+FF also.

Seems Gutenberg is getting lost even if we save the page frequently. There are issues with List vs List Item : child items are displayed as child of the same list item but Gutenberg created another List at another level that is not visible.
The only workaround i found is to manage nested levels with the List View in the Editor. it is impossible directly when typing.

To sum up, the List block is very instable, and its very hard to manage our contents. We have to take care not to loose some when editing our articles.

I guess those 2 List specific ssues are related, and rely on sublists.

Step-by-step reproduction instructions

Just create an article with List block

Screenshots, screen recording, code snippet

It'll post screenshots / screencasts as a follow up as soon as the errors occur back

Environment info

• WP 6.2.2 / WP 6.3 RC3 but it's a old behavior
• Gutenberg but it's not specific to this release
• FF or Chrome latests versions

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes