The Edit Macro dialog also shows space and spaces as two separate fields, although they set the same thing, the pages whose tags are shown, and setting both renders the error "Do not use "space" and "spaces" parameter in the same time". A single location picker accepting one or several pages could serve both uses, with minimal logic on the user input: one page picked is written to the single-page parameter, several to the multi-page one, whatever their final names are. XWIKI-25534 provides that picker for these parameters.
