[Rd] Apply .Rbuildignore before copying files in R CMD build

[Gábor Csárdi]

On Thu, Aug 29, 2024 at 12:12 AM Duncan Murdoch
<murdoch.duncan using gmail.com> wrote:
[...]
> I think the reason is simplicity.  The build process can add, delete or
> modify files.  You wouldn't want that to happen on the original source
> files, so R copies the files to a temporary location to run things.
>
> If it applied .Rbuildignore first, then important files for the build
> might not be available, and the build could fail.

AFAICT the ignored files are deleted right after the copy, so they
are not present during the build process. (But FIXME.)