wizard, multisig: on bip39/hw ks, only ask for script type for 1st ks

When setting up a multisig wallet, there is no point in asking for the
script type for each cosigner (bip39/hw) -- we can just ask for the
first one. If the first keystore is an electrum seed, we end up never asking :)

electrum/base_wizard.py

@@ -410,6 +410,7 @@ class BaseWizard(Logger):
             _('You can override the suggested derivation path.'),
             _('If you are not sure what this is, leave this field unchanged.')
         ])
+        hide_choices = False
         if self.wallet_type == 'multisig':
             # There is no general standard for HD multisig.
             # For legacy, this is partially compatible with BIP45; assumes index=0
@@ -420,6 +421,14 @@ class BaseWizard(Logger):
                 ('p2wsh-p2sh', 'p2sh-segwit multisig (p2wsh-p2sh)', purpose48_derivation(0, xtype='p2wsh-p2sh')),
                 ('p2wsh',      'native segwit multisig (p2wsh)',    purpose48_derivation(0, xtype='p2wsh')),
             ]
+            # if this is not the first cosigner, pre-select the expected script type,
+            # and hide the choices
+            script_type = self.get_script_type_of_wallet()
+            if script_type is not None:
+                script_types = [*zip(*choices)][0]
+                chosen_idx = script_types.index(script_type)
+                default_choice_idx = chosen_idx
+                hide_choices = True
         else:
             default_choice_idx = 2
             choices = [
@@ -430,9 +439,16 @@ class BaseWizard(Logger):
         while True:
             try:
                 self.derivation_and_script_type_gui_specific_dialog(
-                    run_next=f, title=_('Script type and Derivation path'), message1=message1,
-                    message2=message2, choices=choices, test_text=is_bip32_derivation,
-                    default_choice_idx=default_choice_idx, get_account_xpub=get_account_xpub)
+                    run_next=f,
+                    title=_('Script type and Derivation path'),
+                    message1=message1,
+                    message2=message2,
+                    choices=choices,
+                    test_text=is_bip32_derivation,
+                    default_choice_idx=default_choice_idx,
+                    get_account_xpub=get_account_xpub,
+                    hide_choices=hide_choices,
+                )
                 return
             except ScriptTypeNotSupported as e:
                 self.show_error(e)
@@ -529,7 +545,14 @@ class BaseWizard(Logger):
         k = keystore.from_bip39_seed(seed, passphrase, derivation, xtype=script_type)
         self.on_keystore(k)
 
-    def on_keystore(self, k):
+    def get_script_type_of_wallet(self) -> Optional[str]:
+        if len(self.keystores) > 0:
+            ks = self.keystores[0]
+            if isinstance(ks, keystore.Xpub):
+                return xpub_type(ks.xpub)
+        return None
+
+    def on_keystore(self, k: KeyStore):
         has_xpub = isinstance(k, keystore.Xpub)
         if has_xpub:
             t1 = xpub_type(k.xpub)

electrum/gui/qt/installwizard.py

@@ -610,11 +610,12 @@ class InstallWizard(QDialog, MessageBoxMixin, BaseWizard):
             title: str,
             message1: str,
             choices: List[Tuple[str, str, str]],
+            hide_choices: bool = False,
             message2: str,
             test_text: Callable[[str], int],
             run_next,
             default_choice_idx: int = 0,
-            get_account_xpub=None
+            get_account_xpub=None,
     ) -> Tuple[str, str]:
         vbox = QVBoxLayout()
 
@@ -640,7 +641,8 @@ class InstallWizard(QDialog, MessageBoxMixin, BaseWizard):
             line.setText(c_default_text[idx])
         clayout = ChoicesLayout(message1, c_titles, on_choice_click,
                                 checked_index=default_choice_idx)
-        vbox.addLayout(clayout.layout())
+        if not hide_choices:
+            vbox.addLayout(clayout.layout())
 
         vbox.addWidget(WWLabel(message2))