Yes, it does work under kde. As with almost every app that exists, it depends only on the libraries of the window manager (gnome, in this case).
An app wouldnt work in a specific WM only if it did weird things, or if it where something like an applet, that depended on some "visual" part of the WM, wich, by definition is actually NOT the WM, it is a Panel, part of a Desktop Environment...
A WM just manages windows, and if it does it in the correct way, ANY program would work under it.