Cursor jumps to first character while editing a message

[fraenki]

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Steps to reproduce

1. Write a chat message and send it.
2. Use CTRL+UP to edit the chat message.
3. Now another participant should send a message while you are still editing/typing your own message.
4. In the edit screen, the cursor jumps to the first character. So instead of typing at the end of the message, you accidentially continue at the start of the message.

Expected behaviour

Messages from other participants should not interfere with me while typing a message.

Actual behaviour

The cursor is automatically reset to the first position of the message while typing.

Diagnosis and logs