Something I’ve wanted since version 1.0 is the ability to choose which version of a widget to keep when pasting between documents, rather than having to always use the version being pasted.
a classic indeed 
Do you think it is enough to just say “use project” and “use clipboard”-widgets (the same we do with copying colors) which applies to all affected widgets? Or do you need a choice here "use Widget A from clipboard but Widget B the project version and so on … "?
I think ideally you’d have a choice for each widget, especially useful for copying screens.