comctl32:,trackbar: make sure a MN_CUSTOMDRAW is not sent for calls to TBM_SETPOS with the current value

Josep Ma [JAZ] josepma at
Sun Jul 6 06:22:13 CDT 2008

This patch fixes an issue that can happen when an application calls 
TBM_SETPOS with the value it already has.
In normal circumstances, this wouldn't cause any trouble, but in the 
specific application named in bug #13112, it prevented the buttons on 
the toolbar to be operational.

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