In src/filetypes.h:

> @@ -113,6 +113,9 @@ GeanyFiletypeID;
>  
>  #define filetype_id GeanyFiletypeID /* compat define - should be removed in the future */
>  
> +/** Filetype categories
> + *
> + * These are used to provide submenus for each category in the GUI */

Yes (this was made before the other decision I still don't agree with).

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