several iterations in one plot result in sometimes missing/overwritten plots

[thse <t.s...@fz...>]

when using the "for" loop in a "plot" command several times, e.g.
plot for [i=1:3] x-i, for [j=1:2] x-j-5
the last "for" loop sets the internal variable "highest_iteration"
in "plot2d.c" which results in missing plots when the preceding
loops have more iterations.

example (the second plot shows the error):

reset
set xrange [-10:10]
set yrange [-10:10]
plot for [i=1:3] x-i title "i=".i, for [j=1:3] x-j-5 title "j=".j
pause -1
plot for [i=1:3] x-i title "i=".i, for [j=1:2] x-j-5 title "j=".j

adding two lines to "plot2d.c" repairs this.

--- plot2d.c.orig       2016-09-28 00:00:09.000000000 +0200
+++ plot2d.c    2016-10-26 16:40:50.238197804 +0200
@@ -2966,11 +2966,13 @@
        if (empty_iteration(plot_iterator) && this_plot) {
            this_plot->plot_type = NODATA;
        } else if (forever_iteration(plot_iterator) && (this_plot->plot_type
== NODATA)) {
+           if (plot_iterator->iteration > highest_iteration)
            highest_iteration = plot_iterator->iteration;
        } else if (forever_iteration(plot_iterator) && (this_plot->plot_type
== FUNC)) {
            int_error(NO_CARET,"unbounded iteration in function plot");
        } else if (next_iteration(plot_iterator)) {
            c_token = start_token;
+           if (plot_iterator->iteration > highest_iteration)
            highest_iteration = plot_iterator->iteration;
            continue;
        }



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