Fix the issue in a better and complete way as described in parsonsmatt/intero-neovim#153 (comment)

Author: sras

src/nvim/terminal.c

@@ -1115,6 +1115,7 @@ static void refresh_terminal(Terminal *term)
     refresh_size(term, buf);
     refresh_scrollback(term, buf);
     refresh_screen(term, buf);
+    redraw_buf_later(buf, NOT_VALID);
   });
   long ml_added = buf->b_ml.ml_line_count - ml_before;
   adjust_topline(term, buf, ml_added);