No longer call draw_if_interactive in parasite_axes. (matplotlib#23156)

This is a remnant of the pre-staleness system, where all pyplot
functions used to call draw_if_interactive to trigger a draw_idle; this
has now been superseded with the stale system which likewise triggers a
draw_idle (here via add_subplot, which marks the figure as stale).

This way, the only remaining places that call draw_if_interactive
internally are in plt.figure() and in figure unpickling.

Author: anntzer

lib/mpl_toolkits/axes_grid1/parasite_axes.py

@@ -257,7 +257,6 @@ def host_axes(*args, axes_class=Axes, figure=None, **kwargs):
         figure = plt.gcf()
     ax = host_axes_class(figure, *args, **kwargs)
     figure.add_axes(ax)
-    plt.draw_if_interactive()
     return ax
 
 
@@ -280,5 +279,4 @@ def host_subplot(*args, axes_class=Axes, figure=None, **kwargs):
         figure = plt.gcf()
     ax = host_subplot_class(figure, *args, **kwargs)
     figure.add_subplot(ax)
-    plt.draw_if_interactive()
     return ax