For editing large XML documents, it would be very helpful to have an modus, where the lines would automatically wrap at a certain right column (fixed column or the window border). The best I have seen so far ist the soft-word wrap mode in jEdit, especially since it indents the next line correctly.
would render as (50 columns)
or when set to 40 columns:
Note, that only the view wraps the line, there is no line separator touched.