bug#37633: Column part interpreted wrong in compilation mode

[Anton Ertl]

On Sat, Oct 05, 2019 at 07:16:53PM +0300, Eli Zaretskii wrote:
> For byte offsets in external text we have bufferpos-to-filepos, but
> that requires us to know the encoding of the external text.  We need
> to find a reasonable way of getting that.  Suggestions and patches
> welcome.

It's the encoding that you assumed for the text when you loaded the
file into the buffer.

The assumption may be wrong, which may cause problems elsewhere, but
should not cause problems for interpreting the byte position, because
the byte position does not depend on the encoding (unlike the
character position).

- anton