When sending empty packets to maintain the session, it will be entered [J

When I use telnet to try to maintain the session, obviously this tab is not helpful ,it will be entered `[J`

Look like

Reproduce the issue in the terminal by using telnet and sending empty packets to maintain the session, then observe why the literal `[J` appears. The work is done when session-keeping packets no longer insert `[J` into the terminal view; the issue does not name a source file or test to run.

Written by the indexing model from the issue text.