sc tiled editing: Set the viewport size to document size
sc tiled editing: Set the viewport size to document size

When clicking out of range of viewport, the cursor position and edit in place view get wrong values.

Change-Id: I210705c9f8909598d8d47c15c14c06f96bfc4caa

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core