Tabs always get messed up in the insert code in post editor

[Interferon]

I always have problems with indentation in code inserted into a post. For us, the code box is a critical feature that is heavily used, since we have a programming forum. Would be nice if this worked correctly. It looks like there is a combination of space and tab characters, I'm not sure what is going on.

Edited November 15, 2020 by Interferon