AUV3 plugin on iOS not honouring constraints

[reuk]

There’s some more info here:

Auv3 resizing issue on macos (not ios)

I’ve spent some time debugging this. There seem to be several issues with AUv3 resizing, only one of which we can work around in JUCE: JUCE plugins were not responding to host-initiated resize requests. I have a fix for this, which I’ll push once it’s been reviewed. Unfortunately, this only seems to work on Big Sur. On Catalina, I can’t get host-initiated resize to work for JUCE plugins or for Apple’s AUv3 Filter Demo. Given that Apple’s demo is broken, I think this is likely a platform issue. …