solving plot is pushed to left after the first plot

sohstationviewer/view/plotting/plotting_widget/plotting_widget.py

@@ -241,10 +241,9 @@ class PlottingWidget(QtWidgets.QScrollArea):
             view_port_size = self.maximumViewportSize()
         view_port_width = view_port_size.width()
         self.plotting_axes.canvas.setFixedWidth(view_port_width)
-        fig_width_in = view_port_width/self.parent.dpi_x
+        self.fig_width_in = view_port_width/self.parent.dpi_x
 
         self.plotting_axes.fig.set_dpi(self.parent.actual_dpi)
-        self.plotting_axes.fig.set_figwidth(fig_width_in)
 
         # set view size fit with the scroll's viewport size
         self.main_widget.setFixedWidth(view_port_size.width())
@@ -272,6 +271,13 @@ class PlottingWidget(QtWidgets.QScrollArea):
         max_height = max(self.maximumViewportSize().height(), fig_height)
         self.main_widget.setFixedHeight(max_height)
         self.plotting_axes.canvas.setFixedHeight(max_height)
+        # If figure width is set before canvas height is set, it will be
+        # changed once canvas height is set for the first plotting. But in the
+        # second plotting, that problem won't happen so the figure width remain
+        # the same as what is set. As the result the figure width will be
+        # different between the first plotting and the rest.
+        # To avoid that figure's width has to be set after canvas' height.
+        self.plotting_axes.fig.set_figwidth(self.fig_width_in)
         # calculate height_normalizing_factor which is the ratio to multiply
         # with height ratio of an item to fit in figure height start from
         # 1 to 0.