Qt tx dialog: make "export with xpubs" option always available

not just if one of the keystores is a coldcard

related: https://github.com/spesmilo/electrum/issues/5969#issuecomment-591441399

electrum/gui/qt/transaction_dialog.py

@@ -151,6 +151,9 @@ class BaseTxDialog(QDialog, MessageBoxMixin):
         export_submenu = export_actions_menu.addMenu(_("For CoinJoin; strip privates"))
         self.add_export_actions_to_menu(export_submenu, gettx=self._gettx_for_coinjoin)
         self.psbt_only_widgets.append(export_submenu)
+        export_submenu = export_actions_menu.addMenu(_("For hardware device; include xpubs"))
+        self.add_export_actions_to_menu(export_submenu, gettx=self._gettx_for_hardware_device)
+        self.psbt_only_widgets.append(export_submenu)
 
         self.export_actions_button = QToolButton()
         self.export_actions_button.setText(_("Export"))
@@ -258,6 +261,13 @@ class BaseTxDialog(QDialog, MessageBoxMixin):
         tx.prepare_for_export_for_coinjoin()
         return tx
 
+    def _gettx_for_hardware_device(self) -> PartialTransaction:
+        if not isinstance(self.tx, PartialTransaction):
+            raise Exception("Can only export partial transactions for hardware device.")
+        tx = copy.deepcopy(self.tx)
+        tx.add_info_from_wallet(self.wallet, include_xpubs_and_full_paths=True)
+        return tx
+
     def copy_to_clipboard(self, *, tx: Transaction = None):
         if tx is None:
             tx = self.tx

electrum/plugins/coldcard/qt.py

@@ -70,24 +70,6 @@ class Plugin(ColdcardPlugin, QtPluginBase):
                 ColdcardPlugin.export_ms_wallet(wallet, f, basename)
             main_window.show_message(_("Wallet setup file exported successfully"))
 
-    @hook
-    def transaction_dialog(self, dia: TxDialog):
-        # if not a Coldcard wallet, hide feature
-        if not any(type(ks) == self.keystore_class for ks in dia.wallet.get_keystores()):
-            return
-
-        def gettx_for_coldcard_export() -> PartialTransaction:
-            if not isinstance(dia.tx, PartialTransaction):
-                raise Exception("Can only export partial transactions for {}.".format(self.device))
-            tx = copy.deepcopy(dia.tx)
-            tx.add_info_from_wallet(dia.wallet, include_xpubs_and_full_paths=True)
-            return tx
-
-        # add a new "export" option
-        export_submenu = dia.export_actions_menu.addMenu(_("For {}; include xpubs").format(self.device))
-        dia.add_export_actions_to_menu(export_submenu, gettx=gettx_for_coldcard_export)
-        dia.psbt_only_widgets.append(export_submenu)
-
     def show_settings_dialog(self, window, keystore):
         # When they click on the icon for CC we come here.
         # - doesn't matter if device not connected, continue