Wrapping command elements with empty usage at the end of seq generates extra whitespace in usage

[thibaulthenry]

SpongeVanilla version: 1.12.2-7.3.0
Java version: 8
Operating System: Windows 10
Plugins: only my plugin in development (cosmos)

Hey,

Again a small ticket to inform that wrapping command elements with empty usage at the end of CommandElement#seq generates extra whitespace in command usage.

The problem occurs with GenericArguments#markTrue or GenericArguments#none and all elements with Text.EMPTY usage.

For example:

GenericArguments.seq(
    GenericArguments.string(Text.of("arg1")),
    GenericArguments.markTrue(Text.of("argTrue"))
 ),
GenericArguments.string(Text.of("arg2"))

will generates

It's limited to one extra whitespace per seq element, but with (ok.. kind of strange) arguments wrapping, it accumulates :

GenericArguments.seq(
    GenericArguments.string(Text.of("arg1")),
    GenericArguments.seq(
        GenericArguments.string(Text.of("sub1")),
        GenericArguments.seq(
            GenericArguments.string(Text.of("subsub1")),
            GenericArguments.none()
        ),
        GenericArguments.none()
    ),
    GenericArguments.none()
),
GenericArguments.string(Text.of("arg2"))

will generates

Thank you for reading this issue.

[dualspiral]

Given how minor this issue is, the focus we have on getting our 1.15.2 builds completed and that the commands system has been completely rewritten for API 8 to support the client side completion, I will admit that it is very unlikely that I will look at this. However, I would welcome a PR to fix this if you have the inclination to do it.

[thibaulthenry]

Totally agree, just wanted to write it down to not forget.
I'll try to fix it on free time.