Weird space in front of some output in Node REPL

[jcubic]

[jcubic]

The space appear when Promise takes longer to execute:

lips> (Promise.resolve "x")
"x"
lips> (new Promise (lambda (r) (setTimeout (lambda () (r "x")) 100)))
 "x"

[jcubic]

It was part of the undocumented _refreshLine readline method:

https://github.com/nodejs/node/blob/main/lib/internal/readline/interface.js#L500C1-L503C6

    // Force terminal to allocate a new line
    if (lineCols === 0) {
      this[kWriteToOutput](' ');
    }