RFR: 8294696 - BufferedInputStream.transferTo should drain buffer when mark set

[Markus KARG]

On Mon, 3 Oct 2022 05:50:50 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> > Regarding the `-1` check: I did that to align it with _all other_ checks of `markpos` in the existing source code of BIS. I can undo that change, but following your warning, shouldn't we fix _all other_ checks (independent of this PR) from `markpos < 0` to `markpos == -1` then?
> 
> Probably yes.

I propose that I open another PR for that as those code locations are unrelated to the current PR, and this cross-method change might make the review more complex.

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PR: https://git.openjdk.org/jdk/pull/10525