diff --git a/electrum/gui/qt/util.py b/electrum/gui/qt/util.py
index e07c91439..675579745 100644
--- a/electrum/gui/qt/util.py
+++ b/electrum/gui/qt/util.py
@@ -15,7 +15,7 @@ from PyQt5.QtCore import (Qt, pyqtSignal, QCoreApplication, QThread, QSize, QRec
 from PyQt5.QtWidgets import (QPushButton, QLabel, QMessageBox, QHBoxLayout, QVBoxLayout, QLineEdit,
                              QStyle, QDialog, QGroupBox, QButtonGroup, QRadioButton,
                              QFileDialog, QWidget, QToolButton, QPlainTextEdit, QApplication, QToolTip,
-                             QGraphicsEffect, QGraphicsScene, QGraphicsPixmapItem)
+                             QGraphicsEffect, QGraphicsScene, QGraphicsPixmapItem, QLayoutItem, QLayout, QMenu)
 
 from electrum.i18n import _
 from electrum.util import FileImportFailed, FileExportFailed, resource_path
@@ -45,16 +45,16 @@ _logger = get_logger(__name__)
 dialogs = []
 
 pr_icons = {
-    PR_UNKNOWN:"warning.png",
-    PR_UNPAID:"unpaid.png",
-    PR_PAID:"confirmed.png",
-    PR_EXPIRED:"expired.png",
-    PR_INFLIGHT:"unconfirmed.png",
-    PR_FAILED:"warning.png",
-    PR_ROUTING:"unconfirmed.png",
-    PR_UNCONFIRMED:"unconfirmed.png",
-    PR_BROADCASTING:"unconfirmed.png",
-    PR_BROADCAST:"unconfirmed.png",
+    PR_UNKNOWN: "warning.png",
+    PR_UNPAID: "unpaid.png",
+    PR_PAID: "confirmed.png",
+    PR_EXPIRED: "expired.png",
+    PR_INFLIGHT: "unconfirmed.png",
+    PR_FAILED: "warning.png",
+    PR_ROUTING: "unconfirmed.png",
+    PR_UNCONFIRMED: "unconfirmed.png",
+    PR_BROADCASTING: "unconfirmed.png",
+    PR_BROADCAST: "unconfirmed.png",
 }
 
 
@@ -190,17 +190,20 @@ class Buttons(QHBoxLayout):
                 continue
             self.addWidget(b)
 
+
 class CloseButton(QPushButton):
     def __init__(self, dialog):
         QPushButton.__init__(self, _("Close"))
         self.clicked.connect(dialog.close)
         self.setDefault(True)
 
+
 class CopyButton(QPushButton):
     def __init__(self, text_getter, app):
         QPushButton.__init__(self, _("Copy"))
         self.clicked.connect(lambda: app.clipboard().setText(text_getter()))
 
+
 class CopyCloseButton(QPushButton):
     def __init__(self, text_getter, app, dialog):
         QPushButton.__init__(self, _("Copy and Close"))
@@ -208,17 +211,20 @@ class CopyCloseButton(QPushButton):
         self.clicked.connect(dialog.close)
         self.setDefault(True)
 
+
 class OkButton(QPushButton):
     def __init__(self, dialog, label=None):
         QPushButton.__init__(self, label or _("OK"))
         self.clicked.connect(dialog.accept)
         self.setDefault(True)
 
+
 class CancelButton(QPushButton):
     def __init__(self, dialog, label=None):
         QPushButton.__init__(self, label or _("Cancel"))
         self.clicked.connect(dialog.reject)
 
+
 class MessageBoxMixin(object):
     def top_level_window_recurse(self, window=None, test_func=None):
         window = window or self
@@ -385,6 +391,7 @@ def line_dialog(parent, title, label, ok_label, default=None):
     if dialog.exec_():
         return txt.text()
 
+
 def text_dialog(
         *,
         parent,
@@ -412,6 +419,7 @@ def text_dialog(
     if dialog.exec_():
         return txt.toPlainText()
 
+
 class ChoicesLayout(object):
     def __init__(self, msg, choices, on_clicked=None, checked_index=0):
         vbox = QVBoxLayout()
@@ -558,6 +566,7 @@ def address_field(addresses):
         address_e.setText(addresses[0])
     else:
         addresses = []
+
     def func():
         try:
             i = addresses.index(str(address_e.text())) + 1
@@ -576,7 +585,6 @@ def address_field(addresses):
 
 
 def filename_field(parent, config, defaultname, select_msg):
-
     vbox = QVBoxLayout()
     vbox.addWidget(QLabel(_("Format")))
     gb = QGroupBox("format", parent)
@@ -625,9 +633,6 @@ def filename_field(parent, config, defaultname, select_msg):
     return vbox, filename_e, b1
 
 
-
-
-
 def get_iconname_qrcode() -> str:
     return "qrcode_white.png" if ColorScheme.dark_scheme else "qrcode.png"
 
@@ -646,7 +651,6 @@ def editor_contextMenuEvent(self, p: 'PayToEdit', e: 'QContextMenuEvent') -> Non
 
 
 class GenericInputHandler:
-
     def input_qr_from_camera(
             self,
             *,
@@ -666,7 +670,7 @@ class GenericInputHandler:
             if not data:
                 data = ''
             if allow_multi:
-                new_text = self.text() + data + '\n'
+                new_text = self.text() + data + '\n'  # TODO: unused?
             else:
                 new_text = data
                 try:
@@ -711,7 +715,7 @@ class GenericInputHandler:
             return
         data = scanned_qr[0].data
         if allow_multi:
-            new_text = self.text() + data + '\n'
+            new_text = self.text() + data + '\n'  # TODO: unused?
         else:
             new_text = data
             try:
@@ -951,12 +955,12 @@ class OverlayControlMixin(GenericInputHandler):
         btn.setMenu(menu)
 
 
-
 class ButtonsLineEdit(OverlayControlMixin, QLineEdit):
     def __init__(self, text=None):
         QLineEdit.__init__(self, text)
         OverlayControlMixin.__init__(self, middle=True)
 
+
 class ShowQRLineEdit(ButtonsLineEdit):
     """ read-only line with qr and copy buttons """
     def __init__(self, text: str, config, title=None):
@@ -966,6 +970,7 @@ class ShowQRLineEdit(ButtonsLineEdit):
         self.add_qr_show_button(config=config, title=title)
         self.addCopyButton()
 
+
 class ButtonsTextEdit(OverlayControlMixin, QPlainTextEdit):
     def __init__(self, text=None):
         QPlainTextEdit.__init__(self, text)
@@ -1216,6 +1221,7 @@ def icon_path(icon_basename: str):
 def read_QIcon(icon_basename: str) -> QIcon:
     return QIcon(icon_path(icon_basename))
 
+
 class IconLabel(QWidget):
     HorizontalSpacing = 2
     def __init__(self, *, text='', final_stretch=True):
@@ -1408,6 +1414,7 @@ class QtEventListener(EventListener):
 # decorator for members of the QtEventListener class
 def qt_event_listener(func):
     func = event_listener(func)
+
     @wraps(func)
     def decorator(self, *args):
         self.qt_callback_signal.emit( (func,) + args)