nicer printing of list columns

[jennybc]

nicer printing of list columns

[krlmlr]

We should definitely improve here. Copied reprex from your SO question:

library(Matrix)
library(dplyr)
m <- new("dgCMatrix")
isS4(m)
#> [1] TRUE
df <- data.frame(id = 1:2)
df$matrices <- list(m, m)
df
#> Error in prettyNum(.Internal(format(x, trim, digits, nsmall, width, 3L, : first argument must be atomic
tbl_df(df)
#> Source: local data frame [2 x 2]
#> 
#>      id
#>   (int)
#> 1     1
#> 2     2
#> Variables not shown: matrices (list).

## force dplyr to show the tricky column
tbl_df(select(df, matrices))
#> Source: local data frame [2 x 1]
#> 
#>                                                                      matrices
#>                                                                        (list)
#> 1 <S4:dgCMatrix, CsparseMatrix, dsparseMatrix, generalMatrix, dCsparseMatrix,
#> 2 <S4:dgCMatrix, CsparseMatrix, dsparseMatrix, generalMatrix, dCsparseMatrix,

[hadley]

@krlmlr I think I remember that you like to generate the NEWS from the git commits, so I didn't add a news entry.

[krlmlr]

Thanks. The NEWS are initialized from the bodies of the commit messages in "master" (4b6a6d1), the header is ignored. I can edit them afterwards (3cc26eb), often this isn't even necessary.

[github-actions]

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