[Webkit-unassigned] [Bug 201121] New: Displayed datalist dropdown is out of sync with datalist options elements after DOM update

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=201121

            Bug ID: 201121
           Summary: Displayed datalist dropdown is out of sync with
                    datalist options elements after DOM update
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Forms
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: corsar89 at ya.ru
                CC: cdumez at apple.com, wenson_hsieh at apple.com

Steps to reproduce:
- Focus input element with associated datalist
- Datalist dropdown is displayed with correct options
- Replace old options HTML elements with some new options
- Dropdown stay the same with old options, no new options are displayed
- Dropdown updates to correct values only after new input focus event

Demo
https://jsfiddle.net/dkmcz16f/

Tested in the Safari 12 and Safari TP

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