On display, duplicate whitespace (including unicode whitespace characters) in between sentences or elsewhere within posts will be replaced with a single space. Useful if multiple contributors use different styles for sentence spacing or as a catch-all for any unintended extra whitespace.
This enables consistency in a blog with multiple contributors where one writer uses double spaces between sentences and another uses single spaces.
No modifications are made to the post content itself, the replacement happens when the content is displayed to the user.