This function is intended for use as a pre-processing component in make_split_fun, and should not be called
directly by end users.
Arguments
- df
(
data.frame)
the incoming data corresponding with the parent facet.- spl
(
VarLevelSplit)
the split.- ...
additional parameters passed internally.
See also
Other make_custom_split:
add_combo_facet(),
make_split_fun(),
make_split_result(),
trim_levels_in_facets()
