Sets the last time the bookmark for uri was last modified.
If no bookmark for uri is found then it is created.
The "modified" time should only be set when the bookmark's meta-data
was actually changed. Every function of #GBookmarkFile that
modifies a bookmark also changes the modification time, except for
glib.bookmark_file.BookmarkFile.setVisitedDateTime.
Sets the last time the bookmark for uri was last modified.
If no bookmark for uri is found then it is created.
The "modified" time should only be set when the bookmark's meta-data was actually changed. Every function of #GBookmarkFile that modifies a bookmark also changes the modification time, except for glib.bookmark_file.BookmarkFile.setVisitedDateTime.