redo warnings for overwritten arguments in abline, hline, and vline #3286
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This is a pull request to address #3090, and in part overwrites the work from #2950. This PR ensures that:
mapping
and one or more ofyintercept
/xintercept
/slope
/intercept
are provided.data
and one or more ofyintercept
/xintercept
/slope
/intercept
are provided.It is also worth noting that I changed the test for "data is provided" from
missing(data)
tois.null(data)
. I am not sure if there was a good reason for it to have beenmissing(data)
in the first place, as something likewould possibly not issue a warning.
I may have gone overboard on the gramatically-correct informative warning message function (
warn_ovewritten_args()
), but was trying make all the messages informative without duplicating code.