IMO: you have to look at how OSes and window systems were designed and evolved to get a great answer here. Those processes resulted in systems where the OS or c

IMO: you have to look at how OSes and window systems were designed and evolved to get a great answer here. Those processes resulted in systems where the OS or compositor or window system itself can’t really know when the user is pasting something or not. It could be changed, but it would have lots of implications globally, from rewriting framework code, to changing JS APIs. Edge cases would be handled worse, like non-standard paste gestures or VM integration.