Foreign Commands Not Appearing in 'history' Array When 'sharehistory' Option is Enabled Until a Command is Entered

[Langbart <Langbart@protonmail.com>]

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Guten Tag,

is it a bug that when the 'sharehistory' option is enabled, commands from other shells ('foreign') aren't included in the 'history' array until the user enters a command?

Consider the following widget and settings in my '.zshrc':

```sh
test-history() {
BUFFER=""

print
print -- "=== HISTORY TEST ==="
print -- "history array:"
zmodload -F zsh/parameter p:history || return 1
printf "%s\t%s\n" "${(kv)history[@]}" | head -5

print -- "--------------------"

print -- "fc command:"
print -r -- "$(fc -rl -5)"

zle accept-line
}

zle -N test-history
bindkey '^R' test-history

setopt SHARE_HISTORY
```

I open two terminals, type 'echo Test 1' in Terminal 1, switch to Terminal 2, and press 'Enter' without entering a command. Pressing 'Ctrl-R' shows that the 'history' array doesn't include the 'echo Test 1' entry.

```txt
=== HISTORY TEST ===
history array:

--------------------
fc command:
1* echo Test 1
```

After entering 'echo Test 2' in Terminal 2 and pressing 'Ctrl-R' again in Terminal 2, the output is:

```txt
=== HISTORY TEST ===
history array:
2 echo Test 2
1 echo Test 1
--------------------
fc command:
2 echo Test 2
1* echo Test 1
```

Prepending 'fc -RI' before accessing the 'history' array seems to resolve the issue. Is this the recommended workaround to ensure that the 'history' array lists its resuls like 'fc -rl ...' does ?

```sh
...
[[ "${options[sharehistory]}" == "on" ]] && fc -RI

zmodload -F zsh/parameter p:history || return 1
printf "%s\t%s\n" "${(kv)history[@]}" | head -5

...
```

Related:

- [https://github.com/junegunn/fzf/issues/4061](https://github.com/junegunn/fzf/issues/4061#issuecomment-2436756709)

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