allow for cascading peek

[jrieken]

• open a peek editor for reference search or previewing definitions
• inside that editor you cannot peek anymore
• we should have a way to invoke reference search/peek def in nested editors but without nesting peek inside peek

[jrieken]

@stevencl @kieferrm fyi

[JimViebke]

Any word on this? I'd love to see Code have this feature, like VS.

[jeremyong]

Would like to see this as well. The presence of the Peek Definition function in the nested editor makes it seem like a bug and not a feature request.

[Jonatthu]

Please @jrieken !

[QiWang19]

Does it support nested peek definition in Linux version, 1.28?