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These three changes end up testing for the same thing. The initial 'if' catches different test cases. 'subparsers' or 'remainder' might 'confuse' the 'O' test. The zero-width test ends up weeding out everything but the test cases added for this issue.
 # if we haven't hit the end of the command line strings,
 if start_index + sum(arg_counts) != len(arg_strings_pattern):
 while arg_counts and arg_counts[-1] == 0: 
 arg_counts.pop()
 # same test using selected_pattern (= arg_strings_pattern[start_index:])
 if len(selected_pattern) != sum(arg_counts):
 while arg_counts and arg_counts[-1] == 0: 
 arg_counts.pop()
 # alt test: test for optional in the remaining pattern
 if 'O' in selected_pattern:
 while arg_counts and arg_counts[-1] == 0: 
 arg_counts.pop()