message: Fix prompt jumping during reflow
  If the window is resized while lines are longer than the visible area,
  Alacritty will no longer move down the prompt and pull from history when
  possible but instead keep the prompt in place and move the additional
  lines into the scrollback buffer.
  This fixes
diff: @@ -211,7 +211,7 @@ impl<T: GridCell + Copy + Clone> Grid<T> {
  match self.cols.cmp(&cols) {
  Ordering::Less => self.grow_cols(cols, cursor_pos, template),
  - Ordering::Greater => self.shrink_cols(cols, cursor_pos, template),
  + Ordering::Greater => self.shrink_cols(cols, template),
  Ordering::Equal => (),
  }
  }
  @@ -321,7 +321,7 @@ impl<T: GridCell + Copy + Clone> Grid<T> {
  self.cols = cols;
  }
  - fn shrink_cols(&mut self, cols: index::Column, cursor_pos: &mut Point, template: &T) {
  + fn shrink_cols(&mut self, cols: index::Column, template: &T) {
  // Truncate all buffered lines
  self.raw.shrink_hidden(cols);
  @@ -364,17 +364,11 @@ impl<T: GridCell + Copy + Clone> Grid<T> {
  // Add new row with all removed cells
  self.raw.insert(i, row, max_lines);
  - if cursor_pos.line >= self.lines - 1 {
  // Increase scrollback history
  self.scroll_limit = min(self.scroll_limit + 1, self.max_scroll_limit);
  // Since inserted might exceed cols, we need to check the same line again
  i += 1;
  - } else {
  - // Pull content down if cursor is not at the bottom
  - self.raw.rotate(1);
  - cursor_pos.line += 1;
  - }
  }
  }
  }
  