I recently dipped my toe in cross platform desktop dev with C# via Visual Studio on Windows and then the Mono runtime on Linux. Mono renders the app UI really

I recently dipped my toe in cross platform desktop dev with C# via Visual Studio on Windows and then the Mono runtime on Linux. Mono renders the app UI really well, but it's not pixel accurate - in fact, I found all the widgets to be stretched horizontally by an extra 10%. To confirm it, I put a circular image on the form, compiled it, and ran it in Mono (Rasbian distro) and the circular image was rendered by Mono as a squished oval. Otherwise it's a fairly good solution.