Comment 69 for bug 68040

Yes, that's true, but in theory that's trivial to deal with. If the opening code pushes a null context on the stack when the modal dialog is opened we should be in the exact same situation we're in right now. And from there on, any script that does execute in the modal dialog will push its context onto the stack and so on, as usually happens. Needs testing for sure, but should more or less just work.