message: Fix regression with scrolling regions
  Resolves
diff: @@ -335,7 +335,7 @@ impl<T: Copy + Clone> Grid<T> {
  }
  for line in IndexRange(region.start .. (region.start + positions)) {
  - self.raw[*line].reset(&self.template_row);
  + self.raw[line].reset(&self.template_row);
  }
  }
  }
  