File transfer dialog overflows screen

As of Guacamole 0.9.8, file transfer progress is displayed within a file transfer dialog/notification to the lower-right of the screen. If a very large number of files are transferred, this dialog expands in size, eventually overflowing the top of the screen and hiding the "Clear" button that would otherwise solve this.

The file transfer dialog should not expand without bound. Perhaps there should be a scrollbar and maximum height?