Setting the pinning should fix the corresponding top and left properties. Otherwise you will get weird effects where, for example, the position properties keep changing but the element is not being moved in the corresponding direction.
Example:
Take any view and set "pinning" to "bottom". As you move it around the element will be pinned to the bottom but you'll see the top property continue to update.
Main Points
Setting the pinning should fix the corresponding
topandleftproperties. Otherwise you will get weird effects where, for example, the position properties keep changing but the element is not being moved in the corresponding direction.Example: Take any view and
set "pinning" to "bottom". As you move it around the element will be pinned to the bottom but you'll see thetopproperty continue to update.