[ Version ( since = "3.24" ) ]
public uint folder_flagged_stamp { get; }
The 'folder-flagged-stamp' is a stamp of the 'folder-flagged' flag.
This stamp changes whenever anything would mark the mi 'folder-flagged', regardless the mi being already
'folder-flagged'. It can be used to recognize changes on the 'folder-flagged' flag during the time.