Deleting a line is impossible

[Solar-Simon]

Describe the bug
This bug only appears on my Android Browsers.
When you try to delete a line, the cursor does not jump to the previous line. The line is not deleted
However, the content of the previous line is displayed in the keyboard preview and characters are also deleted there, but without any effect on the file.

To Reproduce
Steps to reproduce the behavior:

1. Go to any text file
2. try to remove characters till the line is empty, try to remove the line
3. cursor does not jump up, line is not removed

Server details:

• Text app version: 3.9.1
• Nextcloud version: 28.0.4

Client details:

• OS: Android Lineage OS 20
• Browser: Firefox, Vivaldi

Logs

Nextcloud log (data/nextcloud.log)

Insert your Nextcloud log here

Browser log

Insert your browser log here, this could for example include:

a) The javascript console log
b) The network log
c) ...

[XueSheng-GIT]

From my experience with Android, this also depends on the keyboard you use. E.g. with MS SwiftKey I can also reproduce your issue. But using the Keepass2Android keyboard, it works as expected.
Maybe you want to check a different keyboard.

[Solar-Simon]

E.g. with MS SwiftKey

It's true this happend with SwiftKey. But also with native Keyboard on LineageOS.
Now it only happens with Firefox. Vivaldi seems to be fine.
So its rather a browser issue? Only that I don't experience this behavior anywhere else so far (only nextcloud text and collective).