[Webkit-unassigned] [Bug 225024] New: Incorrect selection after spliting text node in range

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=225024

            Bug ID: 225024
           Summary: Incorrect selection after spliting text node in range
           Product: WebKit
           Version: Safari 14
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML Editing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: vepomoc at gmail.com
                CC: wenson_hsieh at apple.com

Reproduction steps:

1. Open https://jsfiddle.net/Comandeer/ge4qu390/
2. Place the caret at the end of the second line.
3. Press Backspace.

Expected result:

The last character in the second line is deleted.

Actual result:

The selection jumps to the beginning of the paragraph.

If the reproduction steps are repeated with subsequent lines, the selection will jump to the last place of the split.

The splitting logic imitates what happens in CKEditor 4 during pressing Backspace. The error is not reproducible if the custom splitting logic is replaced with the native Text#splitText() method, but due to a bug in Chrome (https://bugs.chromium.org/p/chromium/issues/detail?id=1201161) connected with this method, I was searching for some workaround and discovered this issue.

It works fine in Firefox 88.0.

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