Reline does not rerender previous line when inserting newline at the end of the buffer

[tompng]

Description

add_newline_rerender.mp4

When you add a new line at the end of the buffer

prompt> while 1
prompt>                        hello█

Auto indent is applied and reline needs to render two lines

prompt> while 1
prompt>   hello # needs to rerender this auto indented line
prompt>   █     # needs to render this added line

But reline only renders added line

prompt> while 1
prompt>   hello(not_displayed) hello(remain_displayed)
prompt>   █

You can check this by force rerender the line by opening and closing a completion dialog

prompt> while 1.abs█
prompt>       o [this  area  is] *lo
prompt>       * [rerendered  by] *
              * [dialog cleanup] *
              ********************

Terminal Emulator

Terminal.app

[ima1zumi]

📝 Steps to reproduce

1. Type while 1 & press Enter
2. Copy & paste hello & press Enter
3. Press↑ key * 2 & → key * 5
4. Type . ( show completion dialog )
5. Press Backspace
6. hello will be moved and hell will not be shown.