changing isosamples messes pm3d ?!

[Dmitri A. S. <das...@gm...>]

Setting isosamples to some high numbers messes up pm3d colormap.

G N U P L O T
        Version 4.2 patchlevel 0
        last modified March 2007
        System: Linux 2.6.20-1.2933.fc6

......

Terminal type set to 'wxt'
gnuplot> set pm3d
gnuplot> splot x+y

(nicely colored plane with colors corresponding
to the colorbar)

gnuplot> set isosamples 100
gnuplot> splot x+y

(the plane all painted red)

Perhaps I do not understand something here, but it appears to me
as a bug.

Sincerely,

Dmitri.