A mysterious tab \t in the vignette datatable-reference-semantics.Rmd

[yihui]

Re-posted from https://github.com/Rdatatable/data.table/pull/5182/files#r1380402289

I discovered a really weird thing on line 95 in vignettes/datatable-reference-semantics.Rmd:

data.table/vignettes/datatable-reference-semantics.Rmd

Line 95 in 4c63390

```

@MichaelChirico has fixed the code fence two years ago, but if you download the source package from CRAN: https://cran.r-project.org/src/contrib/data.table_1.14.8.tar.gz you will find that the first two spaces on this line are actually a tab \t. I don't know what's going on. It will be great if the closing fence could match the opening fence strictly, as the mismatch will be disallowed in knitr in the near future: yihui/knitr#2306 Thanks!

[MichaelChirico]

@yihui I can't say for sure #5182 has made it to a CRAN release yet, can you check if the problem is fixed on current master?

that would be from the R CMD build output tar.gz at current HEAD.

If so, we should include this in the next patch release CC @jangorecki

[yihui]

Yes, I have checked the master branch, and the leading white spaces are truly four spaces, not a tab.

[MichaelChirico]

OK, I checked on the patch release branch (https://github.com/Rdatatable/data.table/tree/hotfix1.14.10) -- the \t was still there, so I think the root issue is that #5182 was never released to CRAN.

I applied the fix to the next patch release, which should hit CRAN "soon".

[yihui]

Perfect. Thank you very much!