pandoc_convert() evaluates output argument in wrong directory

[krlmlr]

In pandoc_convert(), the output argument is forced after changing the working directory. This is unexpected, not documented, and breaks downlit::downlit_md_path() and perhaps others. PR follows.

input <- tempfile("in", fileext = ".md")
input
#> [1] "/tmp/Rtmpl3bcya/in6d94718e979a.md"
writeLines("# Document", input)

output <- "out.md"

# Breaks
writeLines("bogus", output)
normalizePath(output, mustWork = FALSE)
#> [1] "/tmp/Rtmp9ZZAHN/reprex6bed4897d478/out.md"
rmarkdown::pandoc_convert(input, output = normalizePath(output, mustWork = FALSE), verbose = TRUE)
#> /usr/lib/rstudio/bin/pandoc/pandoc +RTS -K512m -RTS /tmp/Rtmpl3bcya/in6d94718e979a.md --output out.md
readLines(output)
#> [1] "bogus"

# Works if we compute output outside of call
writeLines("bogus", output)
output <- normalizePath(output, mustWork = FALSE)
rmarkdown::pandoc_convert(input, output = output, verbose = TRUE)
#> /usr/lib/rstudio/bin/pandoc/pandoc +RTS -K512m -RTS /tmp/Rtmpl3bcya/in6d94718e979a.md --output /tmp/Rtmp9ZZAHN/reprex6bed4897d478/out.md
readLines(output)
#> [1] "Document" "========"

^{Created on 2020-09-03 by the reprex package (v0.3.0)}

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