Can no longer copy content from code blocks

[nickvergessen]

Describe the bug
Ref #5212

To Reproduce
Steps to reproduce the behavior:

1. Have a collective page with a list and inside the list there is a code block:

* List item 1
* List item 2
    ```
    ### Workarounds
    
    <!-- Remove not applicable sections -->
    
    * Disable app X
    * Change config setting Y
    * No workaround available
    ```

2. Copy bits inside the code block
3. Paste any where

Expected behavior
You paste:

### Workarounds

<!-- Remove not applicable sections -->

* Disable app X
* Change config setting Y
* No workaround available

Actual behavior
You paste with list item and code block wrap

Screenshots
If applicable, add screenshots to help explain your problem.

[juliusknorr]

One further related topic I've noticed is that copying a link that was pasted earlier results in a link wrapped in brackets <https://github.com/nextcloud/text/issues/5331>

[juliusknorr]

@elzody Another suggestion from @susnux in #5212 (comment) might also be interesting to check if that is feasible