Odd behavior of "set border" and "splot"

[Dima K. <gn...@di...>]

Hi. I found something odd. Not entirely sure it's a bug.

I'm running the latest gnuplot from git (as of today), but this behavior
isn't new.

I can do this:

  splot x

I then get a plane, with the 4 borders of the xy plane drawn, and the
full-length left vertical axis, and for the other vertical axes, I get
lines from the xyplane up to where the data is.

I can do this:

  set border 0
  splot x

I then get just my plane, with none of the borders drawn at all. Works
with "unset border" too.

But let's say I just want the xy plane, with none of the vertical lines.
"help border" tells me I need to do this:

  set border 15
  splot x

This does NOT work to get rid of all the vertical lines. It removed the
full-length left vertical axis, but the lines from the xyplane up to the
data are still there. Why are those lines there? They aren't described
in "help border", even though "set border 0" does get rid of them. Is
there some other knob that lets you control that? If not, there should
probably be? Is it possible today to draw just the 4 xyplane borders?

Thanks!