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* Extract the top element frame from ReactDebugCurrentFrame This is part of a larger refactor to decouple stack addendums. All renderers have their own way of getting the stack of the currently executing components. There is one special case in Element Validator that adds an additional line for the element being validated. This commit moves that special case in into the validator. There is another case where it looked like this was used in shallow renderer but this is actually something different. It is part of the component stack. It just happens to be that shallow renderer has a simpler implementation of the component stack that just happens to be a single element. This will let us decouple the implementation to get a stack from ReactDebugCurrentFrame and put that in each renderer. * Stop using ReactComponentTreeHook for Fiber Currently we fall back to ReactCurrentOwner in ReactComponentTreeHook for stack addendums. We shouldn't need to because we should use ReactDebugCurrrentFiber. Ensure we always set both ReactDebugCurrentFiber and ReactDebugCurrentFrame so that we can rely on these for all stacks. * Make ReactDebugCurrentFrame implementation independent Introduced ReactDebugCurrentStack for the Stack renderer which does the same thing as ReactDebugCurrentFiber. ReactDebugCurrentFrame no longer keeps track of the current fiber/debug id. That's handled by the individual renderers. Instead, it is now used to keep track of the current *implementation* of the current stack frame. That way it is decoupled from the specifics of the renderers. There can be multiple renderers in a context. What matters is which one is currently executing a debuggable context (such as a render function). * Add debug frames to ReactPartialRenderer (ssr) Basic functionality. * Add shared modules to shallow renderer This is now needed because we share describeComponentFrame.