Introduce the concept of nodes that are semantically transparent:

they are skipped when looking for previous or following high-level
macros.  Examples include roff(7) .ft, .ll, and .ta, mdoc(7) .Sm
and .Tg, and man(7) .DT and .PD.  Use this concept for a variety
of improved decisions in various validators and formatters.

While here,
* remove a few const qualifiers on struct arguments that caused trouble;
* get rid of some more Yoda notation in the vicinity;
* and apply some other stylistic improvements in the vicinity.

I found this class of issues while considering .Tg patches from kn@.

1 files changed, 16 insertions, 0 deletions

diff --git a/regress/mdoc/Rs/transp.out_ascii b/regress/mdoc/Rs/transp.out_ascii
new file mode 100644
index 00000000..cc217ed5
--- /dev/null
+++ b/regress/mdoc/Rs/transp.out_ascii
@@ -0,0 +1,16 @@
+RS-TRANSPARENT(1)           General Commands Manual          RS-TRANSPARENT(1)
+
+NNAAMMEE
+     RRss--ttrraannssppaarreenntt - transparent nodes in reference blocks
+
+SSEEEE AALLSSOO
+     first after title and last, _t_i_t_l_e.
+
+     first, middle, and last before title, _t_i_t_l_e.
+
+     first after title and transparent, middle before transparent, and last
+     before transparent, _t_i_t_l_e.
+
+     first after transparent and last before transparent and title, _t_i_t_l_e.
+
+OpenBSD                        February 27, 2020                       OpenBSD