DynamicSash Scrollbars not updating

[Metallicow]

Operating system: Win7
wxPython version: wxPython-4.0.0rc1.dev3597+5f1ee01-cp27-cp27m-win32
Stock or custom build: snapshot-build
Python version: 2.7.14
Stock or custom build: stock

Description of the problem:
Scrollbars are always 100% width/height and do not update upon initialization and sometimes resizing. This is easily noticable with the horizontal scrollbar, since the stc's text in the demo goes past the edge of the widget. Using the enter key to add a line updates the scrollbars to work tho.