Kyle Marek <kmarek@xxxxxxxx> writes: > Me too, but I think a user-defined mark needs to be a string to > support Unicode characters. Ahh, I didn't even consider making it user-defined. As it seems a lot safer to make this an optional feature, it does sort-of make sense to let the letters used for root & left-root be customizable, and it does make sense to take a multi-byte character, but I am not sure what implications it has if we allowed any string without ensuring that it occupies one display column.
