replace rlang::flatten_if()
#5223
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The upcoming rlang 1.1.0 deprecates
flatten()and variants, see https://github.com/r-lib/rlang/blob/main/NEWS.md.The recommended replacement is
purrr::list_flatten(), but it seems wild to me that ggplot2 would take on an additional dependency for this 1 occasion thatflatten_if()is used.This PR mimics the logic of
purrr::list_flatten()to replacerlang::flatten_if()without taking on {purrr} as a dependency.