@VRonin

I misread your reply.
Was looking at the functor code and thought, huh, why you need C++11 or below.
Missed that you referred with "lambda" to the code sample 1-2 posts earlier.

Yes, the lambda, in which I tell std::max_element how to compare, works.
I still take this as a chance to re-think what I'm doing and if there is a better way.

Thank you :)

@kshegunov

Is append() not safe to call while using an iterator on the same list?

Nope. Append can (and often will) realloc to accommodate the new elements, so the old memory gets invalidated. Since you use a mutable iterator, can't you use that to append to the list?

Thank you so much! I wasn't sure that was possible. I guess I missed that in the documentation.

For those who might have the same problem or are looking to do the same thing with a TextEdit field:

instead of using append, I used QMutableStringListIterator::insert().