v1.9.0b

This release contains error-handling improvements and bug fixes
in preparation for Crystal to exit beta status.

• Parsing improvements

  • Can identify 'https://' inside JavaScript as a URL reference,
    which helps download/serve sites using Disqus.
  • Can identify URL references inside <style> elements.
  • Can identify URL references inside <* style="...">,
    which helps download/serve sites based on phpBB.
  • Can identify data: URL references inside <* srcset="...">.
  • Can rewrite URL references that use [Subresource Integrity].

• Error handling improvements

  • Crashes now provide tracebacks with more context,
    back to the start of the thread in which the crash occurred.

• Major fixes

  • Fix crash when dynamically downloading a served URL which is a member of
    a group being actively downloaded.

• Minor fixes

  • Do not show a progress dialog if the related operation completes quickly,
    fixing a flickering effect especially noticeable on Windows.
  • Can now save projects named with url-unsafe characters like #.
  • Fix closing a project to no longer have a race condition that
    could cause use-after-free of wxPython objects and corrupt memory,
    potentially crashing Crystal later.