bug#8470: ns_dumpglyphs_stretch creates display artifacts

[Chong Yidong]

Alp Aker <aker@pitt.edu> writes:

> ns_dumpglyphs_stretch (in nsterm.m) checks to make sure that it
> doesn't overwrite a window's right fringe or scroll bar.  It doesn't
> perform an analogous check for overruns on the left.  This can cause
> display artifacts to appear when a window is horizontally scrolled.
> Here is a screenshot showing an extreme example of what can happen:
>
> http://www.pitt.edu/~aker/screenshot.png
>
> The problem has been around since at least 23.2.1 and still exists in
> the trunk.
>
> The following patch (against the latest nsterm.m) appears to fix the
> problem:

Thanks, applied to trunk.