qml wizard: "confirm seed" screen to normalize whitespaces

fixes https://github.com/spesmilo/electrum/issues/8442

electrum/base_wizard.py

@@ -719,7 +719,11 @@ class BaseWizard(Logger):
 
     def confirm_seed(self, seed, passphrase):
         f = lambda x: self.confirm_passphrase(seed, passphrase)
-        self.confirm_seed_dialog(run_next=f, seed=seed if self.config.get('debug_seed') else '', test=lambda x: x==seed)
+        self.confirm_seed_dialog(
+            run_next=f,
+            seed=seed if self.config.get('debug_seed') else '',
+            test=lambda x: mnemonic.is_matching_seed(seed=seed, seed_again=x),
+        )
 
     def confirm_passphrase(self, seed, passphrase):
         f = lambda x: self.run('create_keystore', seed, x)

electrum/gui/qml/components/wizard/WCConfirmSeed.qml

@@ -13,7 +13,7 @@ WizardComponent {
     valid: false
 
     function checkValid() {
-        var seedvalid = confirm.text == wizard_data['seed']
+        var seedvalid = wizard.wiz.isMatchingSeed(wizard_data['seed'], confirm.text)
         var customwordsvalid =  customwordstext.text == wizard_data['seed_extra_words']
         valid = seedvalid && (wizard_data['seed_extend'] ? customwordsvalid : true)
     }

electrum/gui/qml/qewizard.py

@@ -4,8 +4,10 @@ from PyQt5.QtCore import pyqtProperty, pyqtSignal, pyqtSlot, QObject
 from PyQt5.QtQml import QQmlApplicationEngine
 
 from electrum.logging import get_logger
+from electrum import mnemonic
 from electrum.wizard import NewWalletWizard, ServerConnectWizard
 
+
 class QEAbstractWizard(QObject):
     _logger = get_logger(__name__)
 
@@ -93,6 +95,10 @@ class QENewWalletWizard(NewWalletWizard, QEAbstractWizard):
         data = js_data.toVariant()
         return self.has_heterogeneous_masterkeys(data)
 
+    @pyqtSlot(str, str, result=bool)
+    def isMatchingSeed(self, seed, seed_again):
+        return mnemonic.is_matching_seed(seed=seed, seed_again=seed_again)
+
     @pyqtSlot('QJSValue', bool, str)
     def createStorage(self, js_data, single_password_enabled, single_password):
         self._logger.info('Creating wallet from wizard data')

electrum/mnemonic.py

@@ -90,6 +90,16 @@ def normalize_text(seed: str) -> str:
     return seed
 
 
+def is_matching_seed(*, seed: str, seed_again: str) -> bool:
+    """Compare two seeds for equality, as used in "confirm seed" screen in wizard.
+    Not just for electrum seeds, but other types (e.g. bip39) as well.
+    Note: we don't use normalize_text, as that is specific to electrum seeds.
+    """
+    seed = " ".join(seed.split())
+    seed_again = " ".join(seed_again.split())
+    return seed == seed_again
+
+
 _WORDLIST_CACHE = {}  # type: Dict[str, Wordlist]
 
 

electrum/tests/test_mnemonic.py

@@ -7,7 +7,7 @@ from electrum import mnemonic
 from electrum import slip39
 from electrum import old_mnemonic
 from electrum.util import bfh
-from electrum.mnemonic import is_new_seed, is_old_seed, seed_type
+from electrum.mnemonic import is_new_seed, is_old_seed, seed_type, is_matching_seed
 from electrum.version import SEED_PREFIX_SW, SEED_PREFIX
 
 from . import ElectrumTestCase
@@ -193,6 +193,26 @@ class Test_seeds(ElectrumTestCase):
             with self.subTest(msg=f"seed_type_subcase_{idx}", seed_words=seed_words):
                 self.assertEqual(_type, seed_type(seed_words), msg=seed_words)
 
+    def test_is_matching_seed(self):
+        self.assertTrue(is_matching_seed(seed="9dk", seed_again="9dk "))
+        self.assertTrue(is_matching_seed(seed="9dk", seed_again=" 9dk"))
+        self.assertTrue(is_matching_seed(seed="9dk", seed_again="  9dk "))
+        self.assertTrue(is_matching_seed(seed="when blade focus", seed_again="when blade focus "))
+        self.assertTrue(is_matching_seed(seed="when blade focus", seed_again=" when  blade       focus  "))
+        self.assertTrue(is_matching_seed(seed=" when  blade  focus  ", seed_again=" when  blade       focus  "))
+        self.assertTrue(is_matching_seed(
+            seed=" when  blade  focus  ",
+            seed_again=
+            """ when  blade
+
+               focus  """))
+
+        self.assertFalse(is_matching_seed(seed="when blade focus", seed_again="wen blade focus"))
+        self.assertFalse(is_matching_seed(seed="when blade focus", seed_again="when bladefocus"))
+        self.assertFalse(is_matching_seed(seed="when blade focus", seed_again="when blAde focus"))
+        self.assertFalse(is_matching_seed(seed="when blade focus", seed_again="when bl4de focus"))
+        self.assertFalse(is_matching_seed(seed="when blade focus", seed_again="when bla4de focus"))
+
 
 class Test_slip39(ElectrumTestCase):
     """ Test SLIP39 test vectors. """