Lost formatting when minimizing message

[ChristophWurst]

Steps to reproduce

1. Set up an account
2. Configure plain messages as default
3. Click + New message
4. Enable formatting
5. Enter formatted text
6. Click outside the modal or the X
7. Resume the message by clicking it at the bottom right

Expected behavior

Formatting is still on

Actual behavior

The text only editor shows but the formatted text is still used internally. It's a weird state.

Mail app version

3.6.0 beta1

Mailserver or service

No response

Operating system

No response

PHP engine version

None

Web server

None

Database

None

Additional info

@st3iny ideas?