bug#44068: 28.0.50; Faulty uses of tabulated-list-format

[Eli Zaretskii <eliz@gnu.org>]

> From: Stephen Berman <stephen.berman@gmx.net>
> Cc: stefankangas@gmail.com,  44068@debbugs.gnu.org
> Date: Wed, 04 Nov 2020 00:12:31 +0100
> 
> > Can you describe the result?  I don't think I have a clear idea what
> > it will be.
> 
> There are two features the patch provides:
> 
> - All sortable columns in tabulated-list-mode derivatives that are wide
>   enough to display a sort indicator when selected do so (sortable
>   columns that are not wide enough include e.g. the first three in the
>   Buffer-menu-mode table).  In contrast, currently, i.e. without the
>   patch, all final sortable columns and some non-final ones that are
>   wide enough do not display the sort indicator when selected.
> 
> - When a column (whether selected or not) is made narrower (by
>   repeatedly typing `{') than the length of the column label in the
>   header line, the label is truncated and displays a trailing ellipis,
>   just like the data lines of such columns in the table (if such a
>   narrowed column is sortable and selected, the the sort indicator is
>   still displayed after the ellipis).  In contrast, currently, the
>   column labels are not truncated, which can lead to misalignment
>   between the header line and the data lines.  (However, even with the
>   patch, misalignment can happen, because the data lines can be
>   truncated to display nothing but the ellipis, while the header line
>   labels always show at least the first letter of the label.  I think
>   the display of the data lines here is questionable, but dealing with
>   that is another issue.)

Sound like good improvements, thanks.