bug#41520: 28.0.50; Crash in character.h due to assertion error

[Pip Cet]

On Mon, May 25, 2020 at 7:28 AM Pip Cet <pipcet@gmail.com> wrote:
> On Mon, May 25, 2020 at 7:06 AM Stefan Kangas <stefan@marxist.se> wrote:
> There's at least one other place that has the same error, so I'll grep
> some more before sending a patch.

Patch attached (it compiles, but I haven't tested it thoroughly). This
should fix two bugs in xdisp.c and a bug in Fend_of_line.

All of these bugs were silently fixed by my pos_t conversion.

At the very least, FETCH_CHAR should be renamed so it's clear that the
right way to use it is FETCH_CHAR (bytepos), not FETCH_CHAR (charpos).
I suggest FETCH_CHAR_AT_BYTEPOS.

0001-Fix-assertion-errors-caused-by-bytepos-charpos-confu.patch
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