Move consuming trailing element whitespace inside the parsers.

This ensures the parsers can take into account the affiliated keywords when setting their source without needing the SetSource trait.

src/parser/comment.rs

@@ -13,6 +13,7 @@ use nom::sequence::tuple;
 
 use super::org_source::OrgSource;
 use super::util::get_consumed;
+use super::util::maybe_consume_trailing_whitespace_if_not_exiting;
 use super::util::org_line_ending;
 use crate::context::parser_with_context;
 use crate::context::ContextElement;
@@ -43,6 +44,8 @@ pub(crate) fn comment<'b, 'g, 'r, 's>(
     let (remaining, mut remaining_lines) =
         many0(preceded(not(exit_matcher), comment_line_matcher))(remaining)?;
 
+    let (remaining, _trailing_ws) =
+        maybe_consume_trailing_whitespace_if_not_exiting(context, remaining)?;
     let source = get_consumed(input, remaining);
     let mut value = Vec::with_capacity(remaining_lines.len() + 1);
     let last_line = remaining_lines.pop();