Feature or a bug - when editing existing text, sometimes replace the next character

[Xtian Simon]

If you've used the text editor VIM, then you know the Replace mode.
Lately I've noticed a Jupyter Notebook will exhibit this behavior.

Is this a feature or a bug.

If it's a feature, What's it called. How do you toggle regular editing and this Replace behavior?

[Lawrence D’Oliveiro]

On Saturday, February 3, 2018 at 12:18:28 PM UTC+13, Xtian Simon wrote:

If you've used the text editor VIM, then you know the Replace mode.

I’ve used the text editor Emacs, and I know the Replace mode.

 

How do you toggle regular editing and this Replace behavior?

That’s usually what the INS key is for.