13.1

13.1

• NEW: Snippets: Respect the Retry-After header when a URL responds with a 429. The server's requested delay is
  used instead of our backoff, and the snippet fails right away if it is longer than the longest we would wait
  ourselves (backoff_factor times max_retries).
• NEW: Snippets: Split snippet processing into steps that an extension can override (parse_snippet_target,
  select_snippet_lines, and process_snippet_lines) to add notation or change included content, and add
  get_syntax_mask to find which lines are snippet notation so they can be left alone. (#3040)
• FIX: Fix an issue where only our test environment required Python Markdown 3.10.3. Installs must require this.
• FIX: Snippets: Fix quadratic time complexity when parsing very long runs of ; or - in content, and very long
  snippet paths with line ranges.
• FIX: Quotes, Details (legacy), Tabbed (legacy), FancyLists, Blocks, and Snippets: Gracefully stop short of the
  recursion limit when content is nested too deeply, instead of raising a RecursionError. This includes content
  nested inside of a document structure that is already deep, such as a quote or tab inside of many nested lists.
  Content past the limit is no longer specially processed (Snippets skips includes past the limit, as it does for
  cyclic includes).