Fix the FIXME in XIValuatorClass case of copy_classes function in XExtInt.c

Merged Alexander Bersenev requested to merge alexbers/libxi:master into master

In addition fix FP3232_TO_DOUBLE macro to correctly compute the fractional part.

This fixes glitchy scrolling in Qt applications when the application was just activated or was scrolled in the backgroud. Qt uses XIQueryDevice call to synchronize internal scroll location with an actual one.

Bug: #10 (closed)

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