pushing handlers, then forgetting to pop them, asserts in Phoenix

Hello, 
I've just found out that this will trigger an assert in Phoenix, when 
destroying the window: 

class MyEvtHandler(wx.EvtHandler): 
    def __init__(self):
        wx.EvtHandler.__init__(self)
        self.Bind(wx.EVT_BUTTON, self.on_clic)

    def on_clic(self, evt):
        print("hello!")
        evt.Skip()

class MainFrame(wx.Frame):
    def __init__(self, *a, **k):
        wx.Frame.__init__(self, *a, **k)
        button = wx.Button(self)
        button.PushEventHandler(MyEvtHandler())

Now when you close the window you get an AssertionError. Apparently, we hit this 
assert in wxWidgets 
<https://github.com/wxWidgets/wxWidgets/blob/master/src/common/wincmn.cpp#L473>, 
checking that "Any additional event handlers should be popped before the 
window is deleted". 
Which is fine, except that I can't remember wxPython Classic ever 
complaining about this. Maybe the old machinery did a better job at 
cleaning up? Or I always been lucky and never experienced a crash because 
of an orphan handler?

riccardo



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