I think Hemingway Mode is not strict enough right now. Sure you can't backspace, but you can still select to overwrite, go back to insert text, or undo if you don't like your previous sentence.
To change that, this PR will (in Hemingway Mode)
- Disable all cursor navigation keys
- Disable undo functionality
- Disable click to move cursor
This is my first time actively developing with both GTK and Python, so feedback is appreciated!