message: Fix Parse and show LaTeX3 warnings.
diff: @@ -8,7 +8,7 @@ const latexError = /^(?:(.*):(\d+):|!)(?: (.+) Error:)? (.+?)$/
  const latexBox = /^((?:Over|Under)full \\[vh]box \([^)]*\)) in paragraph at lines (\d+)--(\d+)$/
  const latexBoxAlt = /^((?:Over|Under)full \\[vh]box \([^)]*\)) detected at line (\d+)$/
  const latexBoxOutput = /^((?:Over|Under)full \\[vh]box \([^)]*\)) has occurred while \\output is active/
  -const latexWarn = /^((?:(?:Class|Package) \S*)|LaTeX) (Warning|Info|Font Warning):\s+(.*?)(?: on input line (\d+))?(\.|\?|)$/
  +const latexWarn = /^((?:(?:Class|Package) \S*)|LaTeX(?: \S*)?|LaTeX3) (Warning|Info):\s+(.*?)(?: on input line (\d+))?(\.|\?|)$/
  const latexPackageWarningExtraLines = /^\((.*)\)\s+(.*?)(?: +on input line (\d+))?(\.)?$/
  const bibEmpty = /^Empty `thebibliography' environment/
  const biberWarn = /^Biber warning:.*WARN - I didn't find a database entry for '([^']+)'/
  