#644

#652

#667

MeasurePipe is now standalone.

#656

#651

As the registration of hidden and visible pages can take place
asynchronously, the array of hidden and visible pages must be sorted

The delay is used to check whether a selection is still available after
PointerUp, as this is often deleted in Firefox under Windows mobile

#628

#623

#582

#613

#552

#448

#605

#605

#606

#606

#605

#608