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/plain_list.rs

@@ -81,7 +81,7 @@ pub(crate) fn plain_list<'b, 'g, 'r, 's>(
     context: RefContext<'b, 'g, 'r, 's>,
     input: OrgSource<'s>,
 ) -> Res<OrgSource<'s>, PlainList<'s>> {
-    let (input, affiliated_keywords) = many0(affiliated_keyword)(input)?;
+    let (remaining, affiliated_keywords) = many0(affiliated_keyword)(input)?;
 
     let contexts = [
         ContextElement::Context("plain list"),
@@ -99,7 +99,7 @@ pub(crate) fn plain_list<'b, 'g, 'r, 's>(
     let mut children = Vec::new();
     let mut first_item_indentation: Option<IndentationLevel> = None;
     let mut first_item_list_type: Option<PlainListType> = None;
-    let mut remaining = input;
+    let mut remaining = remaining;
 
     // The final list item does not consume trailing blank lines (which instead get consumed by the list). We have three options here:
     //
@@ -150,6 +150,8 @@ pub(crate) fn plain_list<'b, 'g, 'r, 's>(
         parser_with_context!(plain_list_item)(&final_item_context)(final_child_start)?;
     children.push((final_child_start, reparsed_final_item));
 
+    let (remaining, _trailing_ws) =
+        maybe_consume_trailing_whitespace_if_not_exiting(context, remaining)?;
     let source = get_consumed(input, remaining);
     Ok((
         remaining,