[vim/vim] Popup line behavior with &lines / &lines - 1 causes echo refresh (Issue #20670)

[Mao-Yining]

mao-yining created an issue (vim/vim#20670)

Steps to reproduce

When a popup is created with line set to &lines or &lines - 1, any echo inside the filter callback triggers a screen refresh that clears or redraws the popup content unexpectedly.

vim9script
popup_create('xxxxxxxxxxxxxxxxxx', {
    line: &lines - 1,
    filter: (win, key) => {
        if key == 'e'
            echo 'ls'
            popup_close(win)
        endif
        return false
    }
})

Press e → echo appears but popup flickers/refreshes.

Expected behaviour

echo should not force a full screen refresh like &lines - 2

Version of Vim

9.2.0747

Environment

MS-Windows GUI and TUI

Logs and stack traces

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