Pasting text into a list block copied from a paragraph block is broken

[ashfame]

Description

Hi, Tested this on a fresh WordPress install with no plugins.

Any text that you copy from a paragraph block or a heading block, it probably copies some meta data along with it, which when pasted in a list item of a list block, prevents the paste operation from working. Nothing happens. Works fine if pasting in paragraph block or heading block.

In browser console, I do see logs Received HTML: Ash and Received plain text: Ash though.

Step-by-step reproduction instructions

• Create a new post. In first paragraph, enter text like "Howdy Ash".
• Hit enter and now switch to a list block (I used markdown parsing functionality to switch to a list by typing a hyphen and hitting Tab key)
• Copy "Ash" from the first block and try to paste in the first list item.
• Nothing happens.

Screenshots, screen recording, code snippet

No response

Environment info

• WordPress version: 5.8 (fresh install)
• No plugins (Reproducible with and without Gutenberg plugin activated)

Pre-checks

• I have searched the existing issues.
• I have tested with all plugins deactivated except Gutenberg.

[mupic]

Inserting text also does not work in a quote block.

[westnz]

I was able to reproduce this. Nothing happened when I tried to paste 'text' into a list block copied from a paragraph block.

[yansern]

I'm not familiar with Copy & Paste operations so this might be completely wrong. A quick investigation into use-paste-handler.js shows that the create() function returns plain text, ignoring the multilineWrapperTags param.

Will be digging into why multilineWrapperTags param is ignored next.

[ellatrix]

The list block has been completely rewritten in #42711. I tested this an the issues seems to be resolved. Feel free to reopen if it's not the case.