@sallyanne - If the dialog is too large to fit the screen, it should stop at the bottom of the screen and display scroll bars. In the old version, it just ran off the screen and in Windows, there was no way to access the rest of the dialog. The goal here is to come up with the best method to allow full access to the dialog.
@mackenzieh - This is a testing version. To install in GIMP 2.8 Windows 64bit, replace the script-fu-exe file on your system with the one posted by Pogogogo. Make a backup copy of your old version before using this one.
@saulgoode - I've tried several screen resolutions in Linux and it works well in all of them. The dialog always stops at the screen's edge and displays scroll bars. In Pogogogo's example, there is a translucent bar at the bottom. I'm not sure if that is an auto-hiding bar or what, but it doesn't look like the dialog stopped there. However, it does look like GIMP's single window stops there. It's kinda hard to tell what's going on.
I think in Windows, the dialog might not be stopping at the screen's edge. Can someone with Windows test this and let me know? What I want to know is, does the dialog run off the bottom of the screen at any point or does it always stop right there at the edge and display scroll bars?
FP's animated
fire script (full version) would not fit my screen in either direction, but with this modification, it works as expected. In Linux, the script dialog stops right at the screen edge and it displays scroll bars. Hopefully, it works the same way in Windows.