"quit" signal for plugins

[Glimmer Labs <glimmer07@xxxxxxxxx>]

I have been developing a plugin that involves users editing files and I need to be able to prompt them to save when the gimp closes.

I have tried using the quit signal in pluginInfo:

GimpPlugInInfo PLUG_IN_INFO =
{
  NULL,
  quit,
  query,
  run
};

This only seems to be called, however, when the plugin closes and not the gimp.
(It is a GTK plugin with it's own window like script-fu, I get the signal when I close the plugin window, but if the user closes the gimp I have no way to clean up.)

Is this a bug or is my understanding of what this callback is supposed to do flawed?
Is there another way to do what I am trying to accomplish?

Thank you for your time,
   Soren Berg
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