Is this a bug in Gnuplot or gdlib?

I was checking out v5.4.1 on centos 7.2 with gdlib 2.3.0. I
simplified the problem down to this script.

unset grid

set nokey

set clip two

set title "GD Line Bug"

set size 1,1

set term png small truecolor butt size 500,400

unset border

unset tics

set output 'mike.png'

set xr [0:6];

set yr [0:2]

plot '-' u 1:2 notitle w l lt 1 lw 9

2.0 1.0

5.0 1.0

e

I get a small, but noticeable dash at the beginning of the
plotted line. The larger the linewidth the more noticeable it
becomes.

I inserted a print statement in the PNG_vector function in
gd.trm. What I see are two calls to PNG_vector. The first call
tries to plot a line of zero length. The second call plots the
correct line.

So why is the zero length line plotted?

MikeS

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