symbols size doubled from 3.1.51 to 3.1.52

[Francesco Potorti`]

When producing a PNG or SVG plot with Octave, the symbols size doubles
switching from 3.1.51 to 3.1.52.

I dumped the gnuplot output, and in fact I see instructions like this:

  set style line 3 linecolor rgb "#000000"
   linewidth 2.000000 pointsize 2.000000;

while the same plot in 3.1.51 produces

  set style line 3 linecolor rgb "#000000"
   linewidth 2.000000 pointsize 1.000000;

Is this change intentional?

If not, I'll try to setup a bug report or even to debug it myself.

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