wizard: don't require seed extension to be set early.

this also fixes deferring multisig constraint validation when seed is same as another cosigner,
but still can have different seed extension

electrum/gui/qt/wizard/wallet.py

@@ -450,7 +450,6 @@ class WCCreateSeed(WalletWizardComponent):
             self.wizard_data['seed_type'] = self.seed_type
             self.wizard_data['seed_extend'] = self.seed_widget.is_ext
             self.wizard_data['seed_variant'] = 'electrum'
-            self.wizard_data['seed_extra_words'] = ''  # empty default
 
     def create_seed(self):
         self.busy = True
@@ -648,7 +647,6 @@ class WCHaveSeed(WalletWizardComponent, Logger):
         else:
             cosigner_data['seed_type'] = self.seed_widget.seed_type
         cosigner_data['seed_extend'] = self.seed_widget.is_ext if self.can_passphrase else False
-        cosigner_data['seed_extra_words'] = ''  # empty default
 
 
 class WCScriptAndDerivation(WalletWizardComponent, Logger):

electrum/wizard.py

@@ -414,10 +414,11 @@ class NewWalletWizard(AbstractWizard):
 
     def keystore_from_data(self, wallet_type: str, data: dict):
         if data['keystore_type'] in ['createseed', 'haveseed'] and 'seed' in data:
+            seed_extension = data['seed_extra_words'] if data['seed_extend'] else ''
             if data['seed_variant'] == 'electrum':
-                return keystore.from_seed(data['seed'], passphrase=data['seed_extra_words'], for_multisig=True)
+                return keystore.from_seed(data['seed'], passphrase=seed_extension, for_multisig=True)
             elif data['seed_variant'] == 'bip39':
-                root_seed = keystore.bip39_to_seed(data['seed'], passphrase=data['seed_extra_words'])
+                root_seed = keystore.bip39_to_seed(data['seed'], passphrase=seed_extension)
                 derivation = normalize_bip32_derivation(data['derivation_path'])
                 if wallet_type == 'multisig':
                     script = data['script_type'] if data['script_type'] != 'p2sh' else 'standard'
@@ -425,7 +426,7 @@ class NewWalletWizard(AbstractWizard):
                     script = data['script_type'] if data['script_type'] != 'p2pkh' else 'standard'
                 return keystore.from_bip43_rootseed(root_seed, derivation=derivation, xtype=script)
             elif data['seed_variant'] == 'slip39':
-                root_seed = data['seed'].decrypt(data['seed_extra_words'])
+                root_seed = data['seed'].decrypt(seed_extension)
                 derivation = normalize_bip32_derivation(data['derivation_path'])
                 if wallet_type == 'multisig':
                     script = data['script_type'] if data['script_type'] != 'p2sh' else 'standard'
@@ -548,15 +549,16 @@ class NewWalletWizard(AbstractWizard):
                 for addr in data['address_list'].split():
                     addresses[addr] = {}
         elif data['keystore_type'] in ['createseed', 'haveseed']:
+            seed_extension = data['seed_extra_words'] if data['seed_extend'] else ''
             if data['seed_type'] in ['old', 'standard', 'segwit']:
                 self._logger.debug('creating keystore from electrum seed')
-                k = keystore.from_seed(data['seed'], passphrase=data['seed_extra_words'], for_multisig=data['wallet_type'] == 'multisig')
+                k = keystore.from_seed(data['seed'], passphrase=seed_extension, for_multisig=data['wallet_type'] == 'multisig')
             elif data['seed_type'] in ['bip39', 'slip39']:
                 self._logger.debug('creating keystore from %s seed' % data['seed_type'])
                 if data['seed_type'] == 'bip39':
-                    root_seed = keystore.bip39_to_seed(data['seed'], passphrase=data['seed_extra_words'])
+                    root_seed = keystore.bip39_to_seed(data['seed'], passphrase=seed_extension)
                 else:
-                    root_seed = data['seed'].decrypt(data['seed_extra_words'])
+                    root_seed = data['seed'].decrypt(seed_extension)
                 derivation = normalize_bip32_derivation(data['derivation_path'])
                 if data['wallet_type'] == 'multisig':
                     script = data['script_type'] if data['script_type'] != 'p2sh' else 'standard'