message: fix tabulation rendering
diff: @@ -1199,13 +1199,17 @@ impl ansi::Handler for Term {
  while col < self.grid.num_cols() && count != 0 {
  count -= 1;
  loop {
  - if (col + 1) == self.grid.num_cols() || self.tabs[*col as usize] {
  + if (col + 1) == self.grid.num_cols() {
  break;
  }
  self.insert_blank(Column(1));
  col += 1;
  +
  + if self.tabs[*col as usize] {
  + break;
  + }
  }
  }
  