remove zoom_marker2_follow_mouse

sohstationviewer/view/plotting/plotting_widget/plotting_widget.py

@@ -466,26 +466,6 @@ class PlottingWidget(QtWidgets.QScrollArea):
         ruler.set_visible(True)
         ruler.xy1 = (xdata, 0)
         ruler.xy2 = (xdata, self.bottom)
-        try:
-            if ruler == self.zoom_marker2:
-                # make zoom_marker2 follow mouse.
-                # need to disconnect when state of rulers change
-                self.follower = self.fig.canvas.mpl_connect(
-                    "motion_notify_event", self.zoom_marker2_follow_mouse)
-        except AttributeError:
-            pass
-
-    def zoom_marker2_follow_mouse(self, mouseevent):
-        """
-        Set zoom_marker2's to follow mouse's x.
-
-        :param mouseevent: motion_notify_event - event to help keeping track
-            of mouse move
-        """
-        xdata = self.get_timestamp(mouseevent)
-        self.zoom_marker2.xy1 = (xdata, 0)
-        self.zoom_marker2.xy2 = (xdata, self.bottom)
-        self.draw()
 
     def keyPressEvent(self, event):
         """