This is a step towards #3309. We want to make longs and long aliases
more consistent in how they handle leading dashes. There is more
flexibility offered in not stripping and it matches the v3 short
behavior of only taking the non-dash form. This starts the process by
disallowing it completely so people will catch problems with it and
remove their existing leading dashes. In a subsequent breaking release
we can remove the debug assert and allow triple-leading dashes.
This commit updates the man page renderer to use a relative margin
indent for environment variable text instead of appending to the
existing help text.
Signed-off-by: Orhun Parmaksız <orhunparmaksiz@gmail.com>
Fixes: #3630
I have access to the `clap-man` name but we use `clap_*`. Rather than
people getting mixed up on which is supposed to use, we went with a
different name.
