FIXED: Missing empty line after a bullet list in help/1 output

A list nested in the body of a definition list (`dd`) was formatted as a
nested list, losing the empty lines that separate it from the surrounding
text.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01T13zyETRgTwZhjk383aj5n

Author: JanWielemaker

library/lynx/html_text.pl

@@ -243,10 +243,21 @@
 
 list_level_margins(State, 2-2) :-
     nonvar(State),
-    State.get(list) == [],
+    block_list_context(State.get(list)),
     !.
 list_level_margins(_, 0-0).
 
+%!  block_list_context(+OpenLists) is semidet.
+%
+%   True when a list opened while OpenLists   are open acts as a normal
+%   block element and thus  needs   surrounding  blank  lines. This is the
+%   case if the list is not nested in an item of an itemized list. As the
+%   body of a `dd` element is a  normal   block  context, a list inside a
+%   definition list is a block element as well.
+
+block_list_context([]).
+block_list_context([dl|_]).
+
 format_list([], _, _, _).
 format_list([H|T], Type, Nth, State) :-
     format_list_element(H, Type, Nth, State),