Opening files by mimetype instead of by file extension

[David Faure]

On mercredi 10 juin 2020 00:52:16 CEST Albert Astals Cid wrote:
> As far as I can see QFileDialog only supports listing by file extension.
> 
> On the other hand it seems in GTK+ land you can get an open file dialog
> listing by mimetype, so I've got one bug about "you're worse than XXX
> because you can't do this"

What does "list by mimetype" mean exactly?
Is this about a mimetype column in the table/tree view? (missing)
Is this about the filter combobox showing mimetypes? (supported)
Or is it something else?

-- 
David Faure, faure at kde.org, http://www.davidfaure.fr
Working on KDE Frameworks 5