Add a test case demonstrating an issue.

src/parser/plain_list.rs

@@ -100,6 +100,7 @@ pub fn plain_list_item<'r, 's>(
         }
         Err(_) => {
             let (remaining, _ws) = space1(remaining)?;
+            // TODO: The problem is we are not capturing trailing whitespace for elements that are before the last element.
             let (remaining, (contents, _exit_contents)) =
                 many_till(element_matcher, exit_matcher)(remaining)?;
             let source = get_consumed(input, remaining);
@@ -296,7 +297,6 @@ mod tests {
 
     #[test]
     fn two_blank_lines_ends_nested_list() {
-        // Plain lists with an asterisk bullet must be indented or else they would be a headline
         let input = r#"1. foo
    1. bar
 
@@ -315,6 +315,40 @@ baz"#;
    1. bar
 
 
+"#
+        );
+    }
+
+    #[test]
+    fn interior_trailing_whitespace() {
+        let input = r#"1. foo
+
+   bar
+
+   1. baz
+
+      lorem
+
+
+ipsum"#;
+        let initial_context: ContextTree<'_, '_> = ContextTree::new();
+        let document_context =
+            initial_context.with_additional_node(ContextElement::DocumentRoot(input));
+        let plain_list_matcher = parser_with_context!(plain_list)(&document_context);
+        let (remaining, result) =
+            plain_list_matcher(input).expect("Should parse the plain list successfully.");
+        assert_eq!(remaining, "ipsum");
+        assert_eq!(
+            result.get_source(),
+            r#"1. foo
+
+   bar
+
+   1. baz
+
+      lorem
+
+
 "#
         );
     }