This variable allows you to specify mangling (post processing) of your output before it is sent to your display. Usually this mangling strips special formatting that you don't want to see (such as colors).
You may specify any number of mangling rule levels by separating them with commas, and you can unspecify a mangling rule by prefixing it with a hyphen.
For a list of all mangle types, see the mangle_types page.
The set mangle_display variable first appeared in epic5-0.0.7.