1839 - Document ignore_default field for account_lines API method

[maria-robobug]

Issue #1839

Adds missing ignore_default request parameter.

[mDuo13]

I have some questions about this parameter. It is my (strongly held) understanding that a trust line that is truly in its default state is automatically deleted. So this parameter must do something slightly different than that. Perhaps it omits trust lines that have where only the perspective account's settings are in the default state—and probably a zero balance as well?

Otherwise, seems fine.

[maria-robobug]

Yeah, I think in this context, "default state" means trust lines where the perspective account has not modified the trust limit and has not applied any custom flags. I don’t think balance is considered in the filtering though.

https://github.com/XRPLF/rippled/blob/develop/src/xrpld/rpc/handlers/AccountLines.cpp#L211-L234

[mDuo13]

Yeah, I think in this context, "default state" means trust lines where the perspective account has not modified the trust limit and has not applied any custom flags. I don’t think balance is considered in the filtering though.

https://github.com/XRPLF/rippled/blob/develop/src/xrpld/rpc/handlers/AccountLines.cpp#L211-L234

Based on that I think balance is considered because it checks who owes a reserve. The account with a positive (nonzero) balance owes the reserve.