From: Matt Armstrong<matt@rfc20.org>
Date: Sat, 22 Oct 2022 21:49:09 -0700
There are two calls to 'overlays_in' in buffer.c that I couldn't cover
from ELisp: 'disable_line_numbers_overlay_at_eob' and
'mouse_face_overlay_overlaps'. They're both display related.
Trying to manually exercise 'disable_line_numbers_overlay_at_eob' I
couldn't find any ELisp that set `display-line-numbers-disable' on an
overlay, and only two that do it in a text property (vc/log-edit.el and
something in helm), so even if there were a bug here I'm not sure anyone
would discover it.
AFAIR, company-mode uses that overlay property. Dmitry, am I right?