recent changes

[Russell Nelson]

Jonathan Coles writes:
 > you don't need to call wxBitmapFromImage. here's a quick diff to do what
 > i'm talking about (maybe you already tried this):

I'm not familiar enough with wxWindows to have tried the right thing.
Your code does what I was trying, and .... seems to always be right.
At least, I see no vertical banding anymore.  I see just the vector
layer drawn on a white background (the mask).

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