commandline/src/CommandLine/Text/HelpText.cs AddLine() calls value.Trim() stripping out example spacing

[tomlm]

In generating help text spacing is supposed to be prefixed to the start of the line to make Usage sections easier to read.

AddLine() calls .Trim() which removes spacing from the start of the line. Since whitespace is used for formatting it should not be calling Trim()

[tomlm]

Perhaps replace with:
int iSpace = 0;
while(Char.IsWhiteSpace(value[iSpace]))
builder.append(value[iSpace++]);
value = value.Substring(iSpace);
to preserve leading whitespace?

[ericnewton76]

@nemec et al, it seems like we should come up with a formal specification about how the help text renders by default. Otherwise I think other's preferences will start leaking into tests and additional PRs like #280. I personally don't mind the changes that #280 makes but I can see it going back and forth, tabs/spaces etc. (ugh, worried about the upcoming flame war just mentioning that)

[nemec]

I'm okay with #280 as well, considering that indent is hardcoded and was accidentally getting thrown away.

I also agree that commandline should be the one to determine spacing in the help generation based on some defined format. We may want to add a Trim() around the FormatCommandLine call so that extra spaces added by the developer in their own examples/descriptions won't throw off our indenting.