[Webkit-unassigned] [Bug 190204] New: slotchange event is not fired when updating connected custom element

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190204

            Bug ID: 190204
           Summary: slotchange event is not fired when updating connected
                    custom element
           Product: WebKit
           Version: Safari 11
          Hardware: Unspecified
                OS: macOS 10.13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tomalecpub at gmail.com
                CC: cdumez at apple.com

## Live sample 

https://jsbin.com/xibohon/3/edit?html,console,output

## Steps to reproduce
 1. create custom element with a child: `<my-element><div></div></my-element>`
 2. define this custom element:
   - on constructor create shadow root, with default slot,
   - attach `slotchange` event listener
 3. observe `slotchange` callback execution.

## Expected result
 `slotchange` callback is called after `connectedCallback`
 This is how it works in Chrome 69.0.3497.100 and Firefox 63.


## Expected result
 `slotchange` callback is not called

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