#2714 multiplot commands in $GPVAL_LAST_MULTIPLOT incorrect inside a bracketed clause

[Ethan Merritt]

Version 6 saves the commands that create a multiplot in a datablock $GPVAL_LAST_MULTIPLOT. However if the commands are embedded in a bracketed clause then the entire bracketed clause is saved rather than just the multiplot commands. This may be harmless or it may cause a non-recoverable error depending on what other commands are in that clause.

Reproducer:

#
# problem with v6 multiplot save mechanism
# if the multiplot is inside a bracketed clause, the whole clause gets saved
#
if (0) {
   print "this line never executed"
} else {
    if (1) {
        print "lines before the multiplot should not be saved"

        set multiplot layout 2,1
        plot sin(x) with lp lt 2
        plot cos(x) with lp lt 4
        unset multiplot

        print "lines after the multiplot should not be saved"
    }
}

print "======================================="
print "Commands saved in $GPVAL_LAST_MULTIPLOT"
print $GPVAL_LAST_MULTIPLOT
print "======================================="

replot