A simple plist entry will do it 
In Xojo without hacking about in what it generates you have to work hard
Heck I can make it crash if it comes down to “well tweak this one bit & ”
Your idea is wrong. We use both hardware and VMs. And at testing, our builds and your cases are tested on supported platforms installed on real hardwares. We do use VM’s, most of the time to test on platforms we don’t officially support, or future platforms.
On one of my first app which runs on Windows and Mac, I had to draw an animation. On Mac, I draw directly in the Paint event (erase old picture and redraw and then update the window). On Window, I had to draw in a picture and then paste this picture. It was longer in number of line code, but quickest when runned (quickest on Win than on Mac).
The Mac was most recent and most expensive than the PC.
I have VS 2013 installed and I’m still surprised they haven’t fixed the flicker in their find dialog, just bring it up and resize it. Since Visual Studio uses mostly custom drawn controls I don’t expect them to run into many flicker issues.