Implement the new fields for latex fragment.

src/parser/latex_fragment.rs

@@ -39,7 +39,7 @@ pub(crate) fn latex_fragment<'b, 'g, 'r, 's>(
         parser_with_context!(bordered_dollar_fragment)(context),
     ))(input)?;
     let value = get_consumed(input, remaining);
-    let (remaining, _trailing_whitespace) =
+    let (remaining, post_blank) =
         maybe_consume_object_trailing_whitespace_if_not_exiting(context, remaining)?;
     let source = get_consumed(input, remaining);
     Ok((
@@ -47,6 +47,7 @@ pub(crate) fn latex_fragment<'b, 'g, 'r, 's>(
         LatexFragment {
             source: source.into(),
             value: value.into(),
+            post_blank: post_blank.map(Into::<&str>::into),
         },
     ))
 }