Calling setSize or enabling the bottom right drag corner does not change the plugin window size on Nuendo 12 for example, only on Windows.
This is no problem for usual resizing if you allow the host to do that.
But what about setting a scale factor?
juce::AudioProcessorEditor::setScaleFactor(newScaleFactor);
or
juce::Desktop::getInstance().setGlobalScaleFactor (newScaleFactor);
do not resize the window to the required new size in Nuendo and Cubase on Windows.
Maybe this is just a problem when working with ARA?
This applies to the attached and detached ARA editor view.