[Uristqwerty]

In an ideal world, I'd think you would put a "tab stop" character before arg1, then a single tab on the following line, with the bonus benefit that the formatting would survive automatic name changes and not create an indent-change-only line in the diff. Trouble being that all IDEs would have to understand that character, and compilers would have to ignore it (hey, ASCII has form feed and vertical tab that could be repurposed...).