wx.lib.plot scrollbars do not show ever

[kurisutsukato]

platform: all
wxPython Version & source: 4.0.3 pypi
Python Version & source: 2.7

The scrollbars of a wx.lib.plot.PlotCanvas are not shown ever:

The issues can be observed in the demo or by running the following code.

from wx.lib.plot import PlotCanvas, PlotGraphics, PolyLine
import wx
import numpy as np

app = wx.App()
f = wx.Frame(None)
canvas = PlotCanvas(f)
f.Fit()
f.Show()

x = np.linspace(0,10,100)
y = x**2

line = PolyLine(np.array([x,y]).T)
pg = PlotGraphics([line])
canvas.Draw(pg)
canvas.showScrollbars = True
canvas.enableZoom = True

app.MainLoop()

[RobinD42]

This issue has been mentioned on Discuss wxPython. There might be relevant details there:

https://discuss.wxpython.org/t/wxpython-4-1-0-released/34564/1