bug#27895: 26.0.50; display-line-numbers and header-line-format alignment

[Mark Oteiza]

On 05/08/17 at 02:24pm, Eli Zaretskii wrote:
> > > From: Mark Oteiza <mvoteiza@udel.edu>
> > > Date: Mon, 31 Jul 2017 21:35:48 -0400
> > >
> > > Enabling display-line-numbers should affect how header-line-format is
> > > shown.
> >
> > I'm not sure I agree with this, not in this general form.  Modes use
> > header-line in different ways, and I don't think we can decide for all
> > of them up front how they should react to line numbers.
> >
> > While I agree that tabulated-list modes and ruler-mode should indeed
> > be sensitive to line numbers, because the header-line in those modes
> > should align with the rest of buffer text, a counter-example is Info
> > mode, where indenting the header-line will IMO make the display look
> > uglier, almost buggy.
> >
> > If people agree that the effect on header-line should be dependent on
> > the mode, then it follows that the fix should be in the modes, not in
> > the display engine.  Fixing tabulated-list-mode will fix all of its
> > descendants; ruler-mode will need a separate fix.  And likewise for
> > any other mode which reports a similar issue.
>
> No further comments, so I've fixed tabulated-list-mode and ruler-mode
> to be sensitive to display-line-numbers, and I'm boldly marking this
> bug done.

Thanks.  Info mode being an exception is fine I suppose, though I don't
agree that it would look buggy.

However, from -Q:

1. C-x C-b
2. M-x global-display-line-numbers-mode

The header line does not change until one does a revert-buffer in the
buffer list.  This doesn't look good to me.