i never tried this and i'm not aware of any iPlug plugins that do it. It seems like it would probably be a real PITA to support this feature too, since it's not officially supported by vst2 (not sure about au) and it will likely not work in all hosts. It might be an idea, rather than dynamically resizing, you could let the user store the dimensions in a text file that gets read when the plugin loads.
FWIW, i think when you read "main" thread in this context it is the same thing as the "graphics thread"... i.e. not a high-priority audio thread.
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