[Webkit-unassigned] [Bug 251313] New: Incorrect text caret placement when RTL text starts with whitespace

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=251313

            Bug ID: 251313
           Summary: Incorrect text caret placement when RTL text starts
                    with whitespace
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
               URL: data:text/html;charset=utf8,<textarea%20dir=rtl%20styl
                    e="font-size:%20500%">%20شسی%20شسی%20شسی%20شسی%20شسی%2
                    0شسی%20شسی%20شسی</textarea><script>document.querySelec
                    tor('textarea').focus()</script>
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ebrahim at gnu.org
                CC: bfulgham at webkit.org, mmaxfield at apple.com,
                    simon.fraser at apple.com, zalan at apple.com

This is a reduction of something that hits me on RTL websites and happens both in Safari 16.2 and tip of tree (5dc808f2):

Steps to reproduce:
Open
data:text/html;charset=utf8,<textarea%20dir=rtl%20style="font-size:%20500%">%20شسی%20شسی%20شسی%20شسی%20شسی%20شسی%20شسی%20شسی</textarea><script>document.querySelector('textarea').focus()</script>
(if caret didn't appear, click on the textarea, press Command+A, press the right arrow key button)

Expected:
The caret should go to right most position, start of the text in RTL.

Actual:
The caret goes after the first space, as can be seen in the attached screen cast.

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