WMF: MovieGl's will all be destroyed when main app window closes, problems in multi-app situation

[richardeakin]

Because MovieGl registers for app main window's getSignalClose() here. I'm wondering if this will be problematic in multi-window situations?

Also, not sure why the MovieGl is tied to a specific window, or would it be OK to close all MovieGl's on app's cleanup signal?