Undefined variable used in `tlf_ae_specific_subgroup()`

Running R CMD check or lintr will say:

* checking R code for possible problems ... NOTE
tlf_ae_specific_subgroup: no visible binding for global variable
  ‘n_group’
tlf_ae_specific_subgroup: no visible binding for global variable
  ‘col_tbl_between’
tlf_ae_specific_subgroup: no visible binding for global variable
  ‘n_comparisons’
Undefined global functions or variables:
  col_tbl_between n_comparisons n_group

The involved lines are introduced in #150:

https://github.com/Merck/metalite.ae/blob/45aba695bb090dec0e87f6df78822a0accefd90f/R/tlf_ae_specific_subgroup.R#L170-L182

It looks like:

n_group, col_tbl_between, and n_comparisons are variables not previously defined in this function.
tapply() does not seem to support non-standard evaluation (NSE).
This is not running under a tidy evaluation context.
There is no with() context for these variables.

Now I'm curious how this code works. Can you please look into this?

Merck / metalite.ae

Undefined variable used in `tlf_ae_specific_subgroup()` #152