bug#27830: 26.0.50; Left fringe gets truncated by a pixel in window not sharing that edge with frame

[martin rudalics]

> Can we be more specific about the "appropriate customizations", e.g.,
> name the variables to customize or have a cross-reference to where
> they are described?

Hopefully, I've been more specific now.  But perhaps we should simply
stop showing vertical borders on graphical frames.

martin