qt: wizard back button disabled while busy. Wrap error texts

electrum/gui/qt/wizard/wallet.py

@@ -16,7 +16,7 @@ from electrum.i18n import _
 from electrum.keystore import bip44_derivation, bip39_to_seed, purpose48_derivation, ScriptTypeNotSupported
 from electrum.plugin import run_hook, HardwarePluginLibraryUnavailable
 from electrum.storage import StorageReadWriteError
-from electrum.util import WalletFileException, get_new_wallet_name, UserCancelled
+from electrum.util import WalletFileException, get_new_wallet_name, UserCancelled, UserFacingException
 from electrum.wallet import wallet_types
 from .wizard import QEAbstractWizard, WizardComponent
 from electrum.logging import get_logger, Logger
@@ -1271,6 +1271,9 @@ class WCHWXPub(WizardComponent, Logger):
                 self.root_fingerprint = client.request_root_fingerprint_from_device()
                 self.label = client.label()
                 self.soft_device_id = client.get_soft_device_id()
+            except UserFacingException as e:
+                self.error = str(e)
+                self.logger.error(repr(e))
             except Exception as e:
                 self.error = repr(e)  # TODO: handle user interaction exceptions (e.g. invalid pin) more gracefully
                 self.logger.error(repr(e))

electrum/gui/qt/wizard/wizard.py

@@ -10,7 +10,7 @@ from PyQt5.QtWidgets import (QDialog, QPushButton, QWidget, QLabel, QVBoxLayout,
 
 from electrum.i18n import _
 from electrum.logging import get_logger
-from electrum.gui.qt.util import Buttons, icon_path, MessageBoxMixin
+from electrum.gui.qt.util import Buttons, icon_path, MessageBoxMixin, WWLabel
 
 if TYPE_CHECKING:
     from electrum.simple_config import SimpleConfig
@@ -58,7 +58,7 @@ class QEAbstractWizard(QDialog, MessageBoxMixin):
         error_l = QLabel(_("Error!"))
         error_l.setAlignment(Qt.AlignCenter)
         error_layout.addWidget(error_l)
-        self.error_msg = QLabel()
+        self.error_msg = WWLabel()
         self.error_msg.setAlignment(Qt.AlignCenter)
         error_layout.addWidget(self.error_msg)
         error_layout.addStretch(1)
@@ -161,6 +161,7 @@ class QEAbstractWizard(QDialog, MessageBoxMixin):
         page = self.main_widget.currentWidget()
         self.title.setText(f'<b>{page.title}</b>' if page.title else '')
         self.back_button.setText(_('Back') if self.can_go_back() else _('Cancel'))
+        self.back_button.setEnabled(not page.busy)
         self.next_button.setText(_('Next') if not self.is_last(page.wizard_data) else _('Finish'))
         self.next_button.setEnabled(page.valid)
         self.main_widget.setVisible(not page.busy and not bool(page.error))