FileFilter.this

Creates a new #GtkFileFilter with no rules added to it. Such a filter doesn’t accept any files, so is not particularly useful until you add rules with [gtk.file_filter.FileFilter.addMimeType], [gtk.file_filter.FileFilter.addPattern], or [gtk.file_filter.FileFilter.addCustom]. To create a filter that accepts any file, use:

GtkFileFilter *filter = gtk_file_filter_new ();
gtk_file_filter_add_pattern (filter, "*");