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Description
Describe the issue
There is no easy way to tell if an HD wallet's balance is entirely contained on HD-keys as opposed to ones imported via importprivkey or ones that were present before a wallet upgrade for example. This could be important to know for backup purposes, etc.
Expected behaviour
Would be nice to have an RPC and/or GUI way to determine if the wallet balance was completely in HD keys or a hybrid between the HD chain and other keys.