Don't print lines connecting different parts of the legend.

diff --git a/doc/doxygen/scripts/steps.pl b/doc/doxygen/scripts/steps.pl
index 3e95334a6e111ac6da0e62c9e369030c526df639..0295816181b698f901d120e9f39af7005ea6df0a 100644 (file)
--- a/doc/doxygen/scripts/steps.pl
+++ b/doc/doxygen/scripts/steps.pl
@@ -253,7 +253,12 @@ foreach $kind (keys %style)
 }
 # now add connections to make sure they appear nicely next to each other
 # in the legend
-print "  basic -- techniques -- fluids -- solids -- time_dependent -- unfinished -- code_gallery;\n";
+print "  basic -- techniques [style=invis];\n";
+print "  techniques -- fluids [style=invis];\n";
+print "  fluids -- solids [style=invis];\n";
+print "  solids -- time_dependent [style=invis];\n";
+print "  time_dependent -- unfinished [style=invis];\n";
+print "  unfinished -- code_gallery [style=invis];\n";
 
 # we need to tell 'dot' that all of these are at the same
 # rank to ensure they appear next to (as opposed to atop)