Check this.
https://specifications.freedesktop.org/menu-spec/latest/category-registry.html
I think the idea is that anything that is outside of the already defined
categories just appears in a miscellaneous section of the menu.
Why do you want to define a new category?
--
Salvo Tomaselli
"Io non mi sento obbligato a credere che lo stesso Dio che ci ha dotato di
senso, ragione ed intelletto intendesse che noi ne facessimo a meno."
-- Galileo Galilei
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