Is is possible to have the VST Plugin(AudioProcessorEditor) fill the host without having to use ResizableCornerComponent? so when the host window resizes your plugin will resize with it. instead of the host getting its width/height from the VST. or is there a event that i can attach to when the host changes i can get its height and width to set my Plugins height and width?
The host parent windows don't provide any facilities for resizing themselves, they always just fit around the size of your editor. If you want it to be resizable, you need to provide your own control like a corner/border resizer to do that.