[FIX] lockSurfaces

[Andreas Raab]

Yup. Small but important fix - if this ever hits you you're dead in the 
water. Thanks for finding it!

Cheers,
   - Andreas

Bert Freudenberg wrote:
> There is a wrong condition in an almost never-taken branch of 
> BitBltSimulation>>lockSurfaces (when src=dst):
> 
>                 isWarping ifFalse:[
>                     "When warping we always need the entire surface for 
> the source"
>                     sourceBits _ self cCode:'fn(sourceHandle, 
> &sourcePitch, 0,0, sourceWidth, sourceHeight)'.
>                 ] ifTrue:[
>                     "Otherwise use overlapping area"
>                     l _ sx min: dx. r _ (sx max: dx) + bbW.
>                     t _ sy min: dy. b _ (sy max: sy) + bbH.
>                     sourceBits _ self cCode:'fn(sourceHandle, 
> &sourcePitch, l, t, r-l, b-t)'.
>                 ].
> 
> As the comments indicate, the condition is reversed. Please include 
> attached fix in VMMaker.
> 
> - Bert -
> 
>