Screenshooting shouldn't depend on windows size
The primary use case for the screenshooter is to share the icon with app maintainers to present them in the context of other apps. Let's agree on a size to use always, regardless of the window size so it's compact enough and doesn't require any fiddling with window size (at which point you'd just use the system screenshooter). I'm suggesting using the smallest size we can shrink to currently which is 940x541px.