render with intermediates_dir fails with images

[petrelharp]

The pandoc call fails because the _files directory is not put in intermediates_dir, so pandoc can't find the images.

MWE:
test.Rmd:

```{r plot}
plot(1)
```

Then, calling

render("test.Rmd", intermediates_dir="temp")

fails with

# pandoc: Could not fetch test_files/figure-html/plot-1.png

This is with the github version of rmarkdown (pulled just now).

Changing the relevant line in render to

files_dir <- intermediates_loc( rmarkdown:::knitr_files_dir(basename(output_file)))

fixes it in my simple case, but might break other use cases.

[yihui]

Should be fixed now. Thanks for the report!

[github-actions]

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