left click on systray under windows show pending events if there are. fixes #4167

src/statusicon.py

@@ -61,8 +61,11 @@ class StatusIcon(systray.Systray):
 		self.status_icon.set_visible(False)
 		self.unsubscribe_events()
 
-	def on_status_icon_left_clicked(self, widget):
-		self.on_left_click()
+	def on_status_icon_left_clicked(self, widget):
+		if len(gajim.events.get_systray_events()) == 0:
+			self.on_left_click()
+		else:
+			self.on_middle_click()
 
 	def set_img(self):
 		'''apart from image, we also update tooltip text here'''