Removing a transfer item causes it to never appear again

On unity while removing a finished transfer it calls the "cancel" function independent of the transfer status:
http://bazaar.launchpad.net/~unity-team/unity8/trunk/view/head:/qml/Panel/Indicators/MenuItemFactory.qml#L814

On transfer service it checks if the transfer can be canceled before call the cancel function.
http://bazaar.launchpad.net/~indicator-applet-developers/indicator-transfer/trunk.15.10/view/head:/src/view-gmenu.cpp#L187
http://bazaar.launchpad.net/~indicator-applet-developers/indicator-transfer/trunk.15.10/view/head:/src/controller.cpp#L80

"can_cancel" only allows cancel items in the finished state:
http://bazaar.launchpad.net/~indicator-applet-developers/indicator-transfer/trunk.15.10/view/head:/src/transfer.cpp#L56

This causes that the "cancel" function is never called on transfer object, and the transfer object will never be removed from the list.

Looks like it does not cause any problems for the user, but it could cause inconsistency in the transfer plugin.