Gnuplot win terminal regression

[Ethan A M. <merritt@u.washington.edu>]

Bastian:

Back in June I applied a patch from you that had the following ChangeLog
entry:

2008-06-24  Bastian Maerkisch  <bma...@we...>
        * src/win/wgraph.c (drawgraph): Don't forget to draw a polyline even
        if it has only a single segment.

There is now a report on the newsgroup that for data files containing 
multiple polyline definitions (e.g. blank lines in the file), each supposedly
independent polyline is connected to the previous one.  From inspection of
the code, I conclude this is due to your change above.  That is, the initial
move command sets polyi=1, but your change causes this to be treated as a
length 1 polyline rather than a move.   Strangely, this happens only for
plots with either "... lc rgb variable" or "... lt palette z".
I don't fully understand why the linetype makes a difference.

Could you have another look at this issue please?  Perhaps the previous
patch should be reverted, or perhaps an additional fix is needed somewhere
in the W_pm3d_setcolor code block in wgraph.c.

I'd like to release an incremental version 4.2.4 sometime soon, and this
is the only regression I know of that would hold it up.

	Ethan

-- 
Ethan A Merritt