Keep new phrase addresses recoverable (#102)

-newphrase installed a seed but left the wallet's visible address as the pre-seed random key and the old random pool intact, so the next address handed out -- a mining payout included -- could be one the twelve words cannot reproduce, while the window said a recovery phrase existed. Installing a phrase now clears the stale pool records (private keys stay in wallet.dat), reserves a derived default receiving key, tolerates already-stored derived keys so repeated installs do not stall the pool, and -restorephrase reports what it recovered rather than the wallet's total transaction count. Self-test covers installing a phrase over a pre-existing random pool.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/main.h b/src/main.h
index a04a4e3..1b0be59 100644
--- a/src/main.h
+++ b/src/main.h
@@ -159,8 +159,9 @@ extern vector<unsigned char> vchHDChainCode;  // 32 bytes (IR)
 extern unsigned int nHDNext;                  // next child index to derive
 inline bool HaveHDSeed() { return vchHDMaster.size() == 32 && vchHDChainCode.size() == 32; }
 
-// Install a seed derived from a mnemonic, replacing any existing one, and reset
-// the derivation counter. Writes to wallet.dat. Returns false and leaves the
+// Install a seed derived from a mnemonic, replacing any existing one. The
+// default receiving key is derived immediately, so the next visible address is
+// covered by the phrase. Writes to wallet.dat. Returns false and leaves the
 // wallet untouched if the phrase is not valid.
 bool SetHDSeedFromMnemonic(const string& strMnemonic, string& strErrorRet);