qml: validate duplicate master key in WCBIP39Refine for BIP39 cosigner seeds (fixes #8432)

electrum/gui/qml/components/wizard/WCBIP39Refine.qml

@@ -43,11 +43,24 @@ WizardComponent {
 
     function validate() {
         valid = false
+        validationtext.text = ''
+
         var p = isMultisig ? getMultisigScriptTypePurposeDict() : getScriptTypePurposeDict()
         if (!scripttypegroup.checkedButton.scripttype in p)
             return
         if (!bitcoin.verifyDerivationPath(derivationpathtext.text))
             return
+
+        if (isMultisig && cosigner) {
+            apply()
+            if (wiz.hasDuplicateMasterKeys(wizard_data)) {
+                validationtext.text = qsTr('Error: duplicate master public key')
+                return
+            } else if (wiz.hasHeterogeneousMasterKeys(wizard_data)) {
+                validationtext.text = qsTr('Error: master public key types do not match')
+                return
+            }
+        }
         valid = true
     }
 
@@ -148,6 +161,13 @@ WizardComponent {
                 onTextChanged: validate()
             }
 
+            InfoTextArea {
+                id: validationtext
+                Layout.fillWidth: true
+                visible: text
+                iconStyle: InfoTextArea.IconStyle.Error
+            }
+
             Pane {
                 Layout.alignment: Qt.AlignHCenter
                 Layout.topMargin: constants.paddingLarge
@@ -199,6 +219,7 @@ WizardComponent {
             participants = wizard_data['multisig_participants']
             if ('multisig_current_cosigner' in wizard_data)
                 cosigner = wizard_data['multisig_current_cosigner']
+            validate()
         }
     }
 }

electrum/gui/qml/components/wizard/WCHaveSeed.qml

@@ -64,6 +64,8 @@ WizardComponent {
             valid = validSeed
             return
         } else {
+            // bip39 validate after derivation path is known
+            if (seed_variant_cb.currentValue == 'electrum') {
                 apply()
                 if (wiz.hasDuplicateMasterKeys(wizard_data)) {
                     validationtext.text = qsTr('Error: duplicate master public key')
@@ -74,6 +76,9 @@ WizardComponent {
                 } else {
                     valid = true
                 }
+            } else {
+                valid = true
+            }
         }
     }
 
@@ -165,6 +170,7 @@ WizardComponent {
 
             InfoTextArea {
                 id: infotext
+                visible: !cosigner
                 Layout.fillWidth: true
                 Layout.columnSpan: 2
                 Layout.bottomMargin: constants.paddingLarge
@@ -214,7 +220,6 @@ WizardComponent {
     Bitcoin {
         id: bitcoin
         onSeedTypeChanged: seedtext.indicatorText = bitcoin.seedType
-        onValidationMessageChanged: validationtext.text = validationMessage
     }
 
     function startValidationTimer() {

electrum/gui/qml/qewizard.py

@@ -60,7 +60,6 @@ class QENewWalletWizard(NewWalletWizard, QEAbstractWizard):
             'bip39_refine': { 'gui': 'WCBIP39Refine' },
             'have_master_key': { 'gui': 'WCHaveMasterKey' },
             'multisig': { 'gui': 'WCMultisig' },
-            # 'multisig_show_masterpubkey': { 'gui': 'WCShowMasterPubkey' },
             'multisig_cosigner_keystore': { 'gui': 'WCCosignerKeystore' },
             'multisig_cosigner_key': { 'gui': 'WCHaveMasterKey' },
             'multisig_cosigner_seed': { 'gui': 'WCHaveSeed' },
@@ -117,6 +116,7 @@ class QENewWalletWizard(NewWalletWizard, QEAbstractWizard):
             self._logger.error(f"createStorage errored: {e!r}")
             self.createError.emit(str(e))
 
+
 class QEServerConnectWizard(ServerConnectWizard, QEAbstractWizard):
 
     def __init__(self, daemon, parent = None):