Fix second ruler not showing up when zooming

sohstationviewer/view/plotting/plotting_widget/plotting_widget.py

@@ -2,11 +2,11 @@
 Class of which object is used to plot data
 """
 import numpy as np
+from PySide2.QtCore import QTimer
 from matplotlib import pyplot as pl
 from PySide2 import QtCore, QtWidgets
 
 from sohstationviewer.conf import constants
-
 from sohstationviewer.view.util.color import set_color_mode
 from sohstationviewer.view.plotting.plotting_widget.plotting_axes import (
     PlottingAxes)
@@ -260,6 +260,7 @@ class PlottingWidget(QtWidgets.QScrollArea):
         self.set_lim()
         self.zoom_marker1.set_visible(False)
         self.zoom_marker2.set_visible(False)
+        self.plotting_axes.canvas.draw()
 
     def on_pick_event(self, event):
         """
@@ -373,9 +374,11 @@ class PlottingWidget(QtWidgets.QScrollArea):
             self.set_ruler_visibled(self.zoom_marker1, xdata)
             self.min_x = xdata
             self.zoom_marker1_shown = True
-            self.set_ruler_visibled(self.zoom_marker2, xdata)
         else:
-            self.zoom_bw_markers(xdata)
+            self.set_ruler_visibled(self.zoom_marker2, xdata)
+            self.plotting_axes.canvas.draw()
+            QTimer.singleShot(1, lambda: self.zoom_bw_markers(xdata))
+            # self.zoom_bw_markers(xdata)
 
     def set_ruler_visibled(self, ruler, xdata):
         """