In my application I want to be able to write markdown code in plain-text and switch between the code view and a rendered view. The rendered view may be read-only except that I want to be able to click and toggle checkboxes - and for those changes to be reflected in the markdown source as well. If anyone knows Obsidian, that would be my ideal solution.

Is there any widget (maybe from a third-party library) that implements this?

I tried to implement this by switching between the standard widgets QPlainTextEdit and QTextEdit. But to reflect changed check boxes back to the source I overwrite it by the Markdown generated by QTextEdit : plainEdit->setPlainText( textEdit->toMarkdown() );. However, I found toMarkdown() quite buggy:

If I call setMarkdown() with `hello world\n` it is correctly rendered as inline code hello world\n. If I then use toMarkdown() it returns `hello world\\n` - so it erroneously escapes the backslash inside the code. So each time I toggle between source and redered view it doubles the amount of backslashes... ^^ Code blocks with ``` are handled correctly. I originally used Qt 5.15 - there were even more bugs...

Does anyone know a good solution?