Hide underlying partitions/devices in use by device mapper and friends from the media:/ tdeioslave

tdeioslave/media/mediamanager/tdehardwarebackend.cpp

@@ -154,6 +154,12 @@ void TDEBackend::AddDevice(TDEStorageDevice * sdevice, bool allowNotification)
 			) {
 			//
 		}
+		/* We also don't display devices that underlie other devices;
+		/* e.g. the raw partition of a device mapper volume
+		*/
+		else if (sdevice->checkDiskStatus(TDEDiskDeviceStatus::UsedByDevice)) {
+			//
+		}
 		else {
 			// Create medium
 			Medium* medium = new Medium(sdevice->uniqueID(), driveUDIFromDeviceUID(sdevice->uniqueID()), "");