qr_window: keep menu in sync with actual visibility

electrum/gui/qt/main_window.py

@@ -1084,6 +1084,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger, QtEventListener):
             else:
                 self.qr_window_geometry = self.qr_window.geometry()
                 self.qr_window.setVisible(False)
+        self.receive_tab.update_receive_qr_window()
 
     def show_send_tab(self):
         self.tabs.setCurrentIndex(self.tabs.indexOf(self.send_tab))

electrum/gui/qt/qrwindow.py

@@ -35,7 +35,7 @@ class QR_Window(QWidget):
 
     def __init__(self, win):
         QWidget.__init__(self)
-        self.win = win
+        self.main_window = win
         self.setWindowTitle('Electrum - '+_('Payment Request'))
         self.setMinimumSize(800, 800)
         self.setFocusPolicy(Qt.NoFocus)
@@ -43,3 +43,6 @@ class QR_Window(QWidget):
         self.qrw = QRCodeWidget()
         main_box.addWidget(self.qrw, 1)
         self.setLayout(main_box)
+
+    def closeEvent(self, event):
+        self.main_window.receive_tab.qr_menu_action.setChecked(False)

electrum/gui/qt/receive_tab.py

@@ -182,7 +182,7 @@ class ReceiveTab(QWidget, MessageBoxMixin, Logger):
             _('Add lightning requests to bitcoin URIs'), 'bip21_lightning', False,
             tooltip=_('This may result in large QR codes'),
             callback=self.update_current_request)
-        menu.addToggle(_("Show QR code window"), self.window.toggle_qr_window)
+        self.qr_menu_action = menu.addToggle(_("Show QR code window"), self.window.toggle_qr_window)
         menu.addAction(_("Import requests"), self.window.import_requests)
         menu.addAction(_("Export requests"), self.window.export_requests)
         # layout