[vim/vim] popup_setoptions() cannot change title immediately (Issue #20426)

[lxhillwind]

lxhillwind created an issue (vim/vim#20426)

Steps to reproduce

vim9script

# v9.2.0080

const p = popup_create('hello', {title: 'title-1'})

timer_start(1000, (_) => {
    p->popup_setoptions({
        title: 'title-2', })
    timer_start(2000, (_) => {
        p->popup_close()
    })
})

Expected behaviour

• A popup window displays, with title 'title-1';
• After 1 second, the title changes to 'title-2';
• After another 2 seconds, the popup window is closed.

Since patch v9.2.0080 (cded5e2 @mattn ; I confirmed with git bisect ), with this snippet, the title will not change to 'title-2' before popup window closes, unless some event happens after calling popup_setoptions() (for example, move cursor with hjkl).

Version of Vim

9.2.0080

Environment

Confirmed on:

OS: MacOS 26.4.1 / Fedora 44.

Logs and stack traces

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