[vim/vim] shell command-line not printed when terminal buffer displayed in regular window in same tabpage (Issue #9341)

[lacygoill]

Steps to reproduce

Run this shell command:

vim -Nu NONE -S <(cat <<'EOF'
    vim9script
    var bufnr: number = term_start(&shell, {hidden: true})
    execute 'buffer ' .. bufnr
    popup_create(bufnr, {
        line: &lines / 2,
        minwidth: &columns / 2,
        border: [],
    })
    term_sendkeys(bufnr, "echo 'test'")
EOF
)

echo 'test' is printed on the shell command-line.

Expected behavior

Nothing is printed on the shell command-line.

Version of Vim

8.2 Included patches: 1-3793

Environment

Operating system: Ubuntu 20.04.3 LTS
Terminal: xterm
Value of $TERM: xterm-256color
Shell: zsh 5.8

Screenshot

Additional Context

The issue does not seem to be caused by the shell. I can still reproduce when replacing &shell with /usr/bin/bash --norc --noprofile:

vim9script
var bufnr: number = term_start('/usr/bin/bash --norc --noprofile', {hidden: true})
execute 'buffer ' .. bufnr
popup_create(bufnr, {
    line: &lines / 2,
    minwidth: &columns / 2,
    border: [],
})
term_sendkeys(bufnr, "echo 'test'")

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[lacygoill]

Nothing is printed on the shell command-line.

I meant: nothing is printed on the shell command-line of the terminal buffer which is displayed in the popup window. No such issue in the regular window.

[lacygoill]

Sorry for the original issue title which was wrong. I had to edit it twice.

[Bram Moolenaar]

Closed #9341 via 3194e5b.