I would potentially be willing to implement this if someone would give me some pointers on how this could be done. Also, if I should make an issue on the repo instead, let me know.
For me only the editor freezes. Do you mean that?
I don’t know if it would be possible/desirable to have the GUI reflect edits in the HTML editor in realtime, but the current behaviour is definitely problematic:
If you change the search before closing the editor, you get an exception.
If you change the active note, very strange things happen. Multiple dialogues opened and I even ended up with two previewers.
This would be fixed if the HTML editor was a modal window.