We don't need PROMPT_COMMAND in Zsh; we are already using %F{color} %f,
which in turn use %{ and %}, which are the equivalent of Bash's
\[ and \].
We can use as many colors as we want and output directly into PS1
(or RPS1) without the risk of buffer wrapping issues.
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>