Merge schwarze@'s changes allowing nested displays. Tweak the patch by

making sure output doesn't add a superfluous newline with the nested displays.
Also add a COMPATIBILITY note.

Rename a macro (DATESIZ) to be in line with OpenBSD (DATESIZE).

1 files changed, 5 insertions, 0 deletions

diff --git a/mdoc.7 b/mdoc.7
index c3badcc4..a73decc0 100644
--- a/mdoc.7
+++ b/mdoc.7
@@ -2739,6 +2739,11 @@ The following problematic behaviour is found in groff:
 .Pp
 .Bl -dash -compact
 .It
+Display macros
+.Pq Sx \&Bd , Sx \&Dl , and Sx \&D1
+may not be nested.
+\*[hist]
+.It
 .Sx \&At
 with unknown arguments produces no output at all.
 \*[hist]