Plugin resizing bug in the JUCE Plugin Host Demo

Hey Jules

Just noticed a bug with the Plugin Host Demo app.

When resizing a VST plugin it doesn't actually change the plugin window size, just the inside display.

However if you then close and reopen the plugin editor it adjusts itself to the right size.

AU's can be resized ok, though it is quite stuttery when changing the size.

I've only tested this on OS X.

Previous thread: http://www.juce.com/forum/topic/resizablecornercomponent-broken-x64-osx

Rail