ArgumentsContext.ignore() should use hidden options_list #76
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```Python
with ArgumentContext('foo') as c:
c.argument('arg1', options_list=['--this'])
with ArgumentContext('foo bar') as c:
c.ignore('arg1')
c.argument('arg2', options_list=['--this'])
```
I will get an error because, although arg1 would be ignored, argparse sees a name conflict between arg1 and arg2. If the ignore method automatically changed the options_list to something else `--__ARG1` for instance, then it won't produce the conflict and avoids me having to do this:
```Python
with ArgumentContext('foo') as c:
c.argument('arg1', options_list=['--this'])
with ArgumentContext('foo bar') as c:
c.argument('arg1', ignore_type, options_list=['--literally-anything-else'])
c.argument('arg2', options_list=['--this'])
```
tjprescott
approved these changes
Mar 16, 2018
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Closes #74