Question about XDamgeSubtract

[Derek Wang]

Hi Keith,

When you run the attached test program, you'll see there is a 
unnecessary damage event  after XDamageSubtrct is invoked and all the 
damaged rectangles are copied to the given region. XDamageSubtrct will 
returns NULL if invoked again after receiving the unnecessary damage 
event.  It seems something wrong on the server side. Would you take a look ?

Thanks,
-derek

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