[Wallet] HD wallets automatic upgrade to sapling features. #2020
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HD wallets (
FEATURE_PRE_SPLIT_KEYPOOL) automatic upgrade toFEATURE_SAPLINGto support shielded functionality by default.This is an straightforward version bump because only the seed is needed to generate the sapling keys tree. More info in #1553.
Plus added a version guard in the shielded addresses generation method, so pre-HD wallets show the proper error when they cannot generate shielded addresses (essentially, will notify the user that he/she needs to upgrade their wallet to support shielded operations).
As an extra information, pre-HD wallets who upgrade to HD running v5, will automatically be upgraded to support sapling features. This was done in #1553 as well.