bug#56393: Actually fix the long lines display bug

[Gregory Heytings]

> I haven't tried your patch, but it sounds like it'd do the trick.

It does indeed, even with a 1GB long line.

> You could also use Fbuffer_line_statistics here, which I think should be 
> faster.

Thanks, this simplifies the patch a bit, see attached.

Actually-fix-the-long-lines-display-bug.patch
Description: Text Data