Changed dragSelectionUpdate() so that it automatically switches from moving the end handle to the start handle as necessary, and no longer relies on originalDragStart and originalDragEnd. This fixes a bug some people were encountering where there would be a crash after certain combinations of double-tap selection and selection with the virtual trackpad.
Changed dragSelectionUpdate() so that it automatically switches from moving the end handle
to the start handle as necessary, and no longer relies on originalDragStart and
originalDragEnd. This fixes a bug some people were encountering where there would be a
crash after certain combinations of double-tap selection and selection with the virtual
trackpad.

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