[data grid] Multiline gets pasted with double quotes

[PEsteves8]

Steps to reproduce

Link to live example: https://mui.com/x/react-data-grid/recipes-editing/

Steps:

1. Visit the example page: https://mui.com/x/react-data-grid/recipes-editing/
2. Add the disableRowSelectionOnClick attribute so that single cells can be selected (it also happens without this, but this makes the example more similar to real use cases)
3. Write in one of the multiline cells a text with actual multiple lines (that is, hit enter to create lines, the ones in the example are single line text).
4. Copy the content of that cell and paste it in another multline cell
5. The content from that cell will have double quotes around the multiline text

Here's a demo:
screen-capture.webm

Also looking at the behavior of Airtable, they also have double quotes when copying, but successfully remove them on pasting, and if pasting on multiline they correctly paste it into one cell, instead of interpreting new lines as meaning new rows and pasting on subsequent rows like mui x ( see: #11754 ).

So ultimately I don't know if the problem is double quotes being copied instead of text with /n characters, or double quotes being pasted instead of removed.

Your environment

Windows 11
Chrome 121

npx @mui/envinfo

  Don't forget to mention which browser you used.
  Output from `npx @mui/envinfo` goes here.

Search keywords: copy paste multiline
Order ID: 82566

[michelengelen]

Hey @PEsteves8 ... I can confirm this bug. I have put it on the board for our team to look at it! Thanks for raising this issue! 🙇🏼

[github-actions]

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