message: Adjust GetBoundingRect for Inclusive end
  GetBoundingRect() has inclusive endpoints. I previously assumed end was exclusive so I drew the bounding rect wrong.
  This also means that we should allow start and end to be the same. Which means that FailFastIf would get hit...
diff: @@ -983,7 +983,7 @@ const unsigned int UiaTextRangeBase::_getViewportHeight(const SMALL_RECT viewpor
  void UiaTextRangeBase::_getBoundingRect(_In_ const COORD startAnchor, _In_ const COORD endAnchor, _Inout_ std::vector<double>& coords) const
  {
  FAIL_FAST_IF(startAnchor.Y != endAnchor.Y);
  - FAIL_FAST_IF(startAnchor.X >= endAnchor.X);
  + FAIL_FAST_IF(startAnchor.X > endAnchor.X);
  const auto viewport = _pData->GetViewport();
  const auto currentFontSize = _getScreenFontSize();
  @@ -1005,7 +1005,7 @@ void UiaTextRangeBase::_getBoundingRect(_In_ const COORD startAnchor, _In_ const
  #pragma warning(suppress : 26496) // analysis can't see this, TODO GH: 4015 to improve Viewport to be less bad because it'd go away if ConvertToOrigin returned instead of inout'd.
  auto endCoord = endAnchor;
  viewport.ConvertToOrigin(&endCoord);
  - bottomRight.x = base::ClampMul<long, long>(endCoord.X, currentFontSize.X);
  + bottomRight.x = base::ClampMul<long, long>(base::ClampAdd(endCoord.X, 1), currentFontSize.X);
  bottomRight.y = base::ClampMul<long, long>(base::ClampAdd(endCoord.Y, 1), currentFontSize.Y);
  // convert the coords to be relative to the screen instead of
  