Regression in build 1964, AddGrowableCol fails

> cat grow.py
from __future__ import print_function

from sys import version
print(version)

import wx
print(wx.__version__)

app = wx.App()

sizer = wx.FlexGridSizer(4, 4, 0, 0)
print("cols", sizer.GetCols(), sizer.EffectiveColsCount)
print("rows", sizer.GetRows(), sizer.EffectiveRowsCount)

sizer.AddGrowableCol(1)
for col in range(sizer.GetCols()):
    print(col, sizer.IsColGrowable(col))


> python grow.py
2.7.11 (v2.7.11:6d1b6a68f775, Dec  5 2015, 20:40:30) [MSC v.1500 64 bit
(AMD64)]
3.0.3.dev1943+fdf739f
cols 4 4
rows 4 4
0 False
1 True
2 False
3 False

> python grow.py
2.7.11 (v2.7.11:6d1b6a68f775, Dec  5 2015, 20:40:30) [MSC v.1500 64 bit
(AMD64)]
3.0.3.dev1964+f780b21
cols 4 4
rows 4 4
Traceback (most recent call last):
  File "grow.py", line 15, in <module>
    sizer.AddGrowableCol(1)
wx._core.wxAssertionError: C++ assertion "!m_cols || idx < (size_t)m_cols"
failed at ..\..\src\common\sizer.cpp(1980) in
wxFlexGridSizer::AddGrowableCol(): invalid column index

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