From: Zdenek Sekera [mailto:zs@...
> > > - the filler lines are 'xxxxx'
> > > I find that distracting (maybe: too imposing), couldn't
> > > we have a possibility to choose the filler char?
> > > If we did, what I would choose would be just a blank line
> > > (all blanks) and hope this filler line can be colored
> > > to something to make clear it is a filler and not a legitimate
> > > blank line
> > Using a blank line with some coloring would be preferred.
You can actually get this by just setting guifg=guibg, for example
:hi DiffDelete guifg=red guibg=red
to get a red line.