I wrote an application for Visual Studio, AtomineerUtils Pro Documentation , in which both regular comments and documentation comments (in XML, Doxygen, Qt, and JavaDoc formats) will be updated and transferred. (This is not free, but it is very inexpensive and there is a 30-day free trial)
It tries to intelligently save important newlines - text such as indentation, bullet lists, blank lines or double space at the end of a line (among other things) will be used as hints for the wrapping mechanism to make sure your formatting is not lost.
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