Forward a message: Edit text field is hidden

[maxgutke]

Describe the bug

When you forward a message in Artemis and switch between Preview and Edit, the text input field is hidden.

To Reproduce

1. Go to a message and click Forward
2. Write something in the edit text field (optional)
3. Click on Preview
4. Click on Edit
5. See error

Expected behavior

The text input should not be hidden:

Screenshots

No response

Which version of Artemis are you seeing the problem on?

8.6.3

What browsers are you seeing the problem on?

Firefox

Additional context

No response

Relevant log output