i.e. setting progress triggers ScTabView::DoResize and an InterpretVisible and
InterpretDirtyCells which resets the mpFormulaGroupCxt that the current rCxt
points to, which is bad, so disable progress for the duration of the GetResult
loop

Change-Id: I8e88cee4dd2308ef61dee934d300a38978833703
(cherry picked from commit e3c1a394)