bug#27847: 26.0.50; mode-line-percent-position: line-based instead of char-based (optionally)

[Alexis]

Eli Zaretskii <eliz@gnu.org> writes:

> > From: Alexis <flexibeast@gmail.com>
> > Cc: Eli Zaretskii <eliz@gnu.org>, 27847@debbugs.gnu.org
> > Date: Fri, 28 Jul 2017 12:44:12 +1000
> >
> > As a data point, i have this as part of my `mode-line-format`
> > setup:
> >
> >     '(:eval
> >       (let ((buffer-line-count (count-lines (point-min)
> >       (point-max))))
> >         (number-to-string
> >          (round
> >           (* 100 (/
> >                   (float (count-lines 1 (point)))
> >                   (if (equal 0 buffer-line-count)
> >                       1
> >                     buffer-line-count)))))))
> >     "%%"
> >
> > which gives me at least a rough percentage (i.e. 'good enough' 
> > for
> > my needs), and i've not noticed any slowdown as a result.
>
> How large are the files you usually edit?

Good point; usually not that large, maybe only a few thousand 
lines at
most. So i just tried opening xdisp.c, and there's certainly some
movement lag there. Not unusably so for me, but i can imagine it 
would
be for others. This is on a Core i5-6200U running Debian x86_64.


Alexis.