Updates the current selection, taking two TextPointer positions to indicate the updated selection.
Assembly: PresentationFramework (in PresentationFramework.dll)
A TextRange is formed from a selection between two positions indicated by TextPointers. One of these positions (indicated by position1) is fixed with respect to the selection, while the other position (indicated by position2) is movable. This is similar to how a selection made by a user using the mouse or keyboard behaves.
The actual ends of the new selection may be adjusted to match any selection heuristics that are applicable to the document that contains the new current selection.