Fix inconsistent marker size between screen and printout (bug #57552) * gl2ps-print.cc (gl2ps_renderer::init_marker): undo changes from cset 46fe22bf1458. * gl-render.h, gl-render.cc (m_printing): New bool data member. (opengl_renderer::draw_figure): Initialize m_printing with the depending on "__printing__" property. (opengl_renderer::points_to_pixels): New method to convert points data to pixels. Returns the original value when renderering for printing purpose. (opengl_renderer::set_linewidth, opengl_renderer::set_linewidth, opengl_renderer::make_marker_list): Use points_to_pixels. * print.m: Comment out line which prevents redrawing plot after printing. The markersize may have been changed for printing and this requires a redraw.

%!function [raa, rbb, igaa, igbb] = sub1 (aa, bb)
%!  global aa bb
%!  aa = 1;
%!  raa = aa;
%!  rbb = bb;
%!  igaa = isglobal ("aa");
%!  igbb = isglobal ("bb");
%!endfunction

%!test <*53579>
%! global aa bb
%! assert (isglobal ("aa"));
%! assert (isglobal ("bb"));
%! aa = 3;
%! xx = 5;
%! [raa, rbb, igaa, igbb] = sub1 (aa, xx);
%! assert (raa, 1);
%! assert (rbb, []);
%! assert (igaa);
%! assert (igbb);
%! assert (xx, 5);
%! clear -global aa bb;  # cleanup after test