1. The OS itself has no "memory" of which files or applications a user most recently used. If you do something from the command line, for example, I can't imagine that "GtkRecentManager" would know about it.
2. Stuff you do from the Gnome desktop, however, should be OK.
And as you see from the link you provided, GtkRecentManager also tracks:
* gtk_recent_info_get_applications
* gtk_recent_info_last_application
* gtk_recent_info_has_application
etc.
'Hope that helps
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