Skip the leading spaces of a lazy continuation line

src/blocks.c

@@ -1196,6 +1196,9 @@ static void add_text_to_container(cmark_parser *parser, cmark_node *container,
   if (parser->current != last_matched_container &&
       container == last_matched_container && !parser->blank &&
       S_type(parser->current) == CMARK_NODE_PARAGRAPH) {
+    // Like any paragraph line, skip the leading spaces and tabs.
+    S_advance_offset(parser, input, parser->first_nonspace - parser->offset,
+                     false);
     add_line(input, parser);
   } else { // not a lazy continuation
     // Finalize any blocks that were not matched and set cur to container:

test/regression.txt

@@ -108,6 +108,24 @@ City:
 </span></p>
 ````````````````````````````````
 
+The leading spaces of a lazy continuation line are not part of the
+paragraph content, as for any other paragraph line.
+
+```````````````````````````````` example
+> `a
+ b`
+
+- `c
+ d`
+.
+<blockquote>
+<p><code>a b</code></p>
+</blockquote>
+<ul>
+<li><code>c d</code></li>
+</ul>
+````````````````````````````````
+
 Issue #530 - link parsing corner cases
 
 ```````````````````````````````` example