message: Fix last panic with `cat /dev/urandom`
diff: @@ -1002,7 +1002,7 @@ impl ansi::Handler for Term {
  if self.cursor.line == self.scroll_region.start {
  self.scroll_down(Line(1));
  } else {
  - self.cursor.line -= 1;
  + self.cursor.line -= min(self.cursor.line, Line(1));
  }
  }
  