qt update notifications: make url clickable; prevent multiple dialogs

electrum/gui/qt/main_window.py

@@ -628,7 +628,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
                            _("Uses icons from the Icons8 icon pack (icons8.com).")))
 
     def show_update_check(self, version=None):
-        self._update_check = UpdateCheck(self, version)
+        self.gui_object._update_check = UpdateCheck(self, version)
 
     def show_report_bug(self):
         msg = ' '.join([

electrum/gui/qt/util.py

@@ -846,6 +846,8 @@ class UpdateCheck(QWidget, PrintError):
         self.content.addWidget(self.heading_label)
 
         self.detail_label = QLabel()
+        self.detail_label.setTextInteractionFlags(Qt.LinksAccessibleByMouse)
+        self.detail_label.setOpenExternalLinks(True)
         self.content.addWidget(self.detail_label)
 
         self.pb = QProgressBar()