Labels plotstyle increases line style

[Benjamin L. <lin...@gm...>]

Hello list,

I came across a (for me) strange behaviour, which is, that if you use 
the "labels" plotstyle increases the linestyle, although no line is drawn.

I am using a 4.3.0 CVS snapshot version.

Test case:
set style data linespoints

set style line 1 lt 1 lc rgb "red"
set style line 2 lt 1 lc rgb "green"
set style line 3 lt 1 lc rgb "blue"

set label 1 "lines should be red and green" at graph 0.5, 0.9

set style increment user

plot '-' u 0:1, '-' u 0:1:1 with labels offset character 0,1,0 , '-' u 0:1
1
2
3
4
5
e
1
2
3
4
5
e
2
3
4
5
6
e

I would expect the lines to have color red and green, not red and blue.

I looked at the source code in src/plot2d.c and found that for certain 
plotstyles this increase of the line style is disabled. However, not for 
the "labels" plotstyle.
Is this deliberate?
May I suggest the following change:

diff -r d67b4d3fbb86 src/plot2d.c
--- a/src/plot2d.c	Mon Aug 31 09:08:58 2009 +0200
+++ b/src/plot2d.c	Mon Aug 31 09:09:17 2009 +0200
@@ -1975,8 +1975,9 @@
  		&& this_plot->plot_style != IMAGE
  		&& this_plot->plot_style != RGBIMAGE
                  && this_plot->plot_style != RGBA_IMAGE
+		&& this_plot->plot_style != LABELPOINTS
  		/* don't increment the default line/point properties if
-		 * this_plot is an image */
+		 * this_plot is an image or labels plot */
  	    ) {
  		if (this_plot->plot_style & PLOT_STYLE_HAS_POINT)
  		    ++point_num;


benjamin