wx.lib.mixins.rubberband.py does not clear the DC before resizing/moving the rubberband

[belono]

Operating system: Ubuntu Linux 24.04 LTS
wxPython version & source: wxPython v.4.2.2 gtk3 (pypi)
Python version & source: Python v.3.12.3 (stock)

Description of the problem:

When drawing a rubberband, multiple bounding boxes are drawn that end up filling the entire window.

Code Example (click to expand)

app   = wx.App()
frame = wx.Frame(None, -1, title='RubberBand Test', size=(300,300))

# Add a panel that the rubberband will work on.
panel = wx.Panel(frame, -1)
panel.SetBackgroundColour(wx.BLUE)

# Create the rubberband
frame.rubberBand = RubberBand(drawingSurface=panel)
frame.rubberBand.reset(aspectRatio=0.5)

# Add a button that creates a new rubberband
def __newRubberBand(event):
    frame.rubberBand.reset()
button = wx.Button(frame, 100, 'Reset Rubberband')
frame.Bind(wx.EVT_BUTTON, __newRubberBand, button)
# Layout the frame
sizer = wx.BoxSizer(wx.VERTICAL)
sizer.Add(panel,  1, wx.EXPAND | wx.ALL, 5)
sizer.Add(button, 0, wx.ALIGN_CENTER | wx.ALL, 5)
frame.SetAutoLayout(1)
frame.SetSizer(sizer)
frame.Show(1)
app.MainLoop()

This is due to a bug in the __drawAndErase() method that is not clearing the DC before moving or resizing the bounding box but drawing another box.

As the fix is so simple I would be happy to contribute a PR fixing this behavior.