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As Steven notes, the patch lacks tests. It also lacks documentation. 
The 2 things that this class does different from 'version' are
- write without passing the text through 'textwrap'
- write to a user defined file
There is a difference in opinion between Éric and Steven as to whether the class should use write directly or use the HelpFormatter.
I don't think it needs further action at this time. There doesn't seem to be a lot of interest in it. Also there are a number of ways of accomplishing the task without adding an Action class.
- the class is a simple adaptation of the 'version' class
- a user defined class works just as well
- 'version' with Raw formatter, and shell redirection also works
- it is also easy to write the text to a file after parse_args.
I've attached a file that illustrates a number of these alternatives. It includes a 'callable' class.
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The discussion got me thinking about a selective version of the RAW formatting, analogous to the HTML <pre> tag. With this the user could mark a given text (description, epilog, help, version etc) as pre-formatted, without having to change the formatter_class.
 parser.add_argument('--license', action='version',
 version=Pre(formatted_text))
I probably should submit that in a new issue.