I'd prefer this (those) percentage(s) to be based on the
number of
_lines_ instead
What do you want to be displayed in that case when line numbers
are
not counted and displayed as "???" ? Do you want Emacs to
count lines
even though the limits which control that are exceeded?
In cases where line numbers are not counted (I didn't know about
such
cases, BTW), I guess Emacs could display "??" as the percentage,
meaning that the value is unknown at that moment.
Also note that for your feature to be implemented, Emacs needs
to
count lines in the entire buffer each time the buffer is
changed, so I
expect this feature to slow down redisplay.
Maybe this computation could be optimized somehow. In any case,
if
someone implements it and the slow down is observable, it could
be
advertised in the manual and/or the docstring of the variable
which
enables this feature.