Can't copy text from paragraph into the list block

[fullofcaffeine]

Description

Can't copy text from paragraph into the list block. This might be a symptom of a lower-level problem, but that's how it manifested so far.

Step-by-step reproduction instructions

1. Start a new page or post and press enter to create a new Paragraph block;
2. Press enter again to break into a new line, then insert a List block;
3. Use your mouse to select the text from the Paragraph block, then copy it;
4. Now give focus to the List block again, create a new bullet point if you hadn't already. Try to paste the text you copied. You won't be able to;
5. Create a new Paragraph and paste the text. This time the text will be pasted as expected.

Other aspects to keep in mind:

• Copying text from within the List block and pasting into it again works;
• Copying another block and pasting from within the List block context works, though the new block is not inserted as an inner block (this is expected, just to note that the actual paste is done)
• Copying text from a context outside the editor canvas and pasting into the list block works (i.e try copying from the browser's address bar and pasting into the list block
• Copying from the page/post heading field into the List block, works.
• This might not be something specific to the List block but more general, but that's the scenario that can be used to easily reproduce the issue.

Expected behaviour

I expect to be able to paste from a Paragraph block (or any source) into the List block without problems.

Actual behaviour

Copying text from a Paragraph block and pasting into the List block doesn't work. It just fails silently. It does work if you paste somewhere else (i.e another Paragraph), so it suggests that it's a problem in the logic that handles pasting for List.

Additional information

I bisected and it led me to this PR: #27967. If you check out its merge commit (06f741e), you'll see the issue still happens at its point. If you then revert it, you'll see it doesn't happen anymore.

Screenshots or screen recording (optional)

Screen.Recording.2021-06-29.at.17.58.16.mov

WordPress information

• WordPress version: 5.8-beta4-51261
• Gutenberg version: trunk
• Are all plugins except Gutenberg deactivated? Yes
• Are you using a default theme (e.g. Twenty Twenty-One)? Yes

Device information

• Device: Desktop
• Operating system: Ubuntu Linux 18.04
• Browser: Firefox 90.0b12 64bit and Chrome 91.0.4472.101 (Official Build) (64-bit)

[skorasaurus]

very similar examples of this cropping up recently:
#32467
#32980
#31067

[4faster]

In my case,
it is not only paragraph to list,
but also any other block type to list block.

However, it has no problem if doing copy-paste from a list to another list
https://wordpress.org/support/topic/version-5-8-gutenberg-cant-copy-some-text-from-a-block-to-list-block/

[tonyzeoli]

I'm having the same issue. Can't copy and paste from a paragraph to a list block.

[paynterf]

Still happening with latest WP 5.8.2

[zachatkinson]

This issue is also apparent with quote and pull quote blocks. So all together no paste from one block in document into either:

• List Block
• Quote Block
• Pullquote Block

[diannevolek]

I can't paste any text at all into a Media block: content? It pastes into notepad, and into a classic block.

In general I"m struggling with blocks to select text and keep it selected for long enough to Ctrl+C. It immediately unselects itself. If I select and press delete to try to get rid of text, it deletes one character.

Gutenberg is a problem guys, it's great for Wordpress designers, but really bad if you have content?

[webcoreinc]

Still can't copy and paste blocks.

"Designing" in "Gutenbug" is a total nightmare and takes twice as long.

I could hand code faster than Gutenbug.

"Gutenbug" is 100% garbage. I am stuck using it in our newsletter and after using Elementor, it's a complete nightmare to use.

The Gutenbug developers should be banned from developing for life.