In Thunar, if I select multiple files, right-click, and then select "Properties", Thunar opens a single properties dialog that shows a "combined view" of the properties of *all* the selected files. However, if I call the `org.freedesktop.FileManager1.ShowItemProperties` d-bus interface, passing it multiple file URIs, Thunar opens up multiple properties dialogs, one for each file. I would expect the d-bus interface to also open a single "combined-view" dialog, no? For reference, this is related to xfdesktop#112