VolatileImage.validate() will always return IMAGE_RESTORED the first time
that method is called for an image. One would expect that the return value
would be IMAGE_OK on the first try. Note that this is only the case when
isAccelerated() returns true.

This is reproducible on 1.4.1, 1.4.2, 5.0, and Mustang. I discovered this
problem while working on the fix for another bug (4902507).

To reproduce, compile and run the attached testcase on a system that has
accelerated VolatileImages. You should see the following output:
in paint()...
creating VolatileImage
Iteration 0: validate returned IMAGE_RESTORED
Iteration 1: validate returned IMAGE_OK
Iteration 2: validate returned IMAGE_OK
Iteration 3: validate returned IMAGE_OK
Iteration 4: validate returned IMAGE_OK

###@###.### 2005-1-29 01:58:02 GMT