[vim/vim] Cannot permanently clear the last search pattern (`@/`) (Issue #20718)

[Barrett Ruth]

barrettruth created an issue (vim/vim#20718)

Steps to reproduce

1. echo foo > /tmp/foo.txt
2. vim -N -i /tmp/vinfo /tmp/foo.txt
3. /foo
4. :let @/ = ""
5. :wq
6. vim -N -i /tmp/vinfo /tmp/foo.txt
7. :echo @/

@/ prints "foo" again, and pressing n jumps to the next match; clear from step 4 is gone.

Expected behaviour

After :let @/ = "" the last search pattern should stay cleared after restarting, just like within the session.

Version of Vim

9.2.0782

Environment

Operating system: NixOS
Terminal: ghostty
Value of $TERM: xterm-256color
Shell: zsh

Logs and stack traces

pattern.txt says :let @/ = "" leaves the pattern ["really cleared, like when starting Vim"](https://github.com/vim/vim/blob/v9.2.0653/runtime/doc/pattern.txt#L273-L276), but viminfo puts it back on the next start.

If persisting the clear isn't wanted maybe clarify in docs?

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