Have to run redraw-display manually

[Cos Chan]

Dear All

I have a problem while using zsh 5.7.1 and GNU Emacs 26.1. The Emacs is
none X.
I have the same problem in Debian 10, 11 and FreeBSD 12, 13. I assume it is
not an OS related problem.

The problem is moving point by M-b/M-f/C-up/C-down or kill words/line, the
display would be wrong.
The point or the characters would be in the wrong places until I manually
run M-x redraw-display to get it back.

I can easily reproduce this problem in zsh, which is gone while the shell
is switched to tcsh.

-- 
Regards
Cos Chan