Fix input sanitation for listchaintxns lncli cmd

[kornpow]

Change Description

This PR was based originally on the PR #7496 and issue #7316 .

Upon rebasing and looking at the solutions there, I found the bigger problem with the command was the lack of error messaging when the end_height < start_height rather than the necessity to support a "reverse ordering" feature.

So while in a separate soon so be opened PR I also implemented "reverse ordering" I thought I would open this one first, as it is more straightforward and an improvement necessary, whether or not reverse ordering is needed/wanted.

This is my first code commit to LND, 2nd including a comment update, so I appreciate the help to getting this PR mergable!

Steps to Test

Try using different options for start_height and end_height, including them, not including them, and having integer values in a way which doesn't make sense, and ensure that the proper errors are shown.

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[guggero]

Thanks for the fix. Makes sense, I think the "will be queried in reverse" was probably from an earlier version of the PR that added the offset.

[kornpow]

"will be queried in reverse"

This wording has been there for a long time, and its what inspired the original issue/PR, even before the offset PR. But now we fixed the help text, we don't have to implement it.

[kornpow]

@guggero I would like to potentially add a test for this, but I am not really sure where? Maybe there isnt tests for these kinds of things.

[guggero]

@guggero I would like to potentially add a test for this, but I am not really sure where? Maybe there isnt tests for these kinds of things.

You could extract the argument parsing into a function, then write a unit test for that in cmd/commands/commands_test.go.

The other approach would be an integration test that executes the binary directly. See

lnd/itest/config.go

Line 14 in 64c660c

func testDebuglevelShow(ht *lntest.HarnessTest) {