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xdgmime: Prevent infinite loops from badly-formed MIME registrations

Merged Emmanuel Fleury requested to merge emmanuel.fleury/xdgmime:Prevent_infinite_loops into master

Prevent recursion of _xdg_mime_cache_mime_type_subclass() with the same value of argument mime for the subclasses of a MIME type.

This was observed in GLib as https://gitlab.gnome.org/GNOME/glib/-/issues/1875, and a backtrace of the infinite loop is here: https://gitlab.gnome.org/GNOME/glib/-/issues/1875#note_592829.

Signed-off-by: Philip Withnall withnall@endlessm.com

Helps: #32

Edited by Philip Withnall