#81 GLCanvas.hs: when window size is reduced, curve is not resized

[Henk-Jan van Tuyl]

Program samples\contrib\GLCanvas.hs from the wxHaskell repository:
When the window size is reduced, the curve is not resized. When the window is enlarged, the curve size grows proportionally.

OS: Windows XP
GHC version: 7.6.3
wxWidgets version: 2.9.5
wxHaskell version: 0.90.1.0 (currently in Github repository)
OpenGL version: 2.8.0.0