Q: puzzle about the index of PrepareAccess

[fancy fang]

Dear all,
           In xserver 1.9.0, there is an access array to cache previous
results to reduce cost. Howver, this optimization would modify the original
index and give the wrong index to driver PrepareAccess. Also, sometimes
driver PrepareAccess need to know the pixmap is used to be read or written.
Now, nobody can confirm that the driver PrepareAccess can get the right
index now. Can someone exaplain this? Thanks!

Best wishes,

Fancy
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