"Change Set:  PixelAtBugFix
Date:   1 March 2004
Author:   Andreas Raab

When using bit peekers or pokers across snapshots BitBlt may eventually
attempt to write into the (compressed) bits of some bitmap, severely
screwing up when it finally realizes that it needs to decompress the form.
This CS forces unhibernation before the the bits are overwritten.

Tests included"
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