PVS-Studio warning V501 for Scintilla

inline bool isMMIXALOperator(char ch) {
  if (isascii(ch) && isalnum(ch))
    return false;
  if (ch == '+' || ch == '-' || ch == '|' || ch == '^' ||
      ch == '*' || ch == '/' || ch == '/' ||
      ch == '%' || ch == '<' || ch == '>' || ch == '&' ||
      ch == '~' || ch == '$' ||
      ch == ',' || ch == '(' || ch == ')' ||
      ch == '[' || ch == ']')
    return true;
  return false;
}

This suspicious code was found in Scintilla project by PVS-Studio static code analyzer.
Warning message is:
V501 There are identical sub-expressions 'ch == '/'' to the left and to the right of the '||' operator.    lexmmixal.cxx  40

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