[Webkit-unassigned] [Bug 232891] New: Dragging the start of a selection from within a contenteditable=true to a nested contenteditable=false collapses it

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=232891

            Bug ID: 232891
           Summary: Dragging the start of a selection from within a
                    contenteditable=true to a nested contenteditable=false
                    collapses it
           Product: WebKit
           Version: Safari 15
          Hardware: iPhone / iPad
                OS: iOS 15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: UI Events
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: scalesjordan at gmail.com

Created attachment 443701

  --> https://bugs.webkit.org/attachment.cgi?id=443701&action=review

Minimum repro of the behavior.

Minimum repro: https://output.jsbin.com/ludusuf
User agent string: Mozilla/5.0 (iPhone; CPU iPhone OS 15_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.1 Mobile/15E148 Safari/604.1

Within an element with contenteditable=true after making a selection:

1. If we extend the "end" of the selection over an element with contenteditable=false, the selection proceeds smoothly and can be later modified.
2. If we extend the "start" of the selection over an element with contenteditable=false, the selection disappears and does not return.

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