wxwidgets - wx.grid/wx.grid.GridTableBase 不能显示超过7M行的数据（用一个很简单的例子）？

Question

众所周知，虚拟 wx.gridtablebase 模型能够显示无限行，但它失败了大约 7M 行。以下最小示例在 wx 版本上进行了测试：
4.1.2a1.dev5165+64e5d863 msw (phoenix) wxWidgets 3.1.5。谢谢。

import wx
import wx.grid

class GTable(wx.grid.GridTableBase):
    def __init__(self):
        wx.grid.GridTableBase.__init__(self)
        
    def GetNumberRows(self):
        return 10000000

    def GetNumberCols(self):
        return 2

    def GetColLabelValue(self, col):
        return "A"+str(col)
        
    def GetRowLabelValue(self, row):
        return str(row+1)
        
    def IsEmptyCell(self, row, col):
        return False

    def GetValue(self, row, col):
        return str(row)+'-'+str(col)
        
    def SetValue(self, row, col, value):
        pass         

class MyGrid(wx.grid.Grid):
    def __init__(self, parent):
        wx.grid.Grid.__init__(self, parent, -1)
        gtable = GTable()
        self.SetTable(gtable,True)  
        #self.MakeCellVisible(1000000,0)
        #self.AdjustScrollbars()
        #self.ForceRefresh()
        #self.Bind(wx.EVT_SCROLLWIN, self.OnScroll)

class TestFrame(wx.Frame):
    def __init__(self, parent):
        wx.Frame.__init__(self, parent, -1, "A Grid", size=(400, 400))
        grid = MyGrid(self)

if __name__ == '__main__':
    app = wx.App()
    frame=TestFrame(None)
    app.SetTopWindow(frame)
    frame.Show()
    app.MainLoop()