Oh, huh. Yea you're right. This should not read the value -- it should calculate the correct value based on the handle position as mouseMoveEvent does.

I think there is a bug in WSliderComposed here that we should fix -- the mouse move handler should be emitting 'down' signals while the release one should emit 'up'. That will make the 'emit-on-release' connection work correctly and the "EventWhileDrag" (which as AFAIK unused in any skin) could be removed in favor of the more general solution provided by the ```<Connection>``` block.