[Webkit-unassigned] [Bug 244261] New: Web Inspector: Assertion hit in Base/Object.js removeEventListener

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=244261

            Bug ID: 244261
           Summary: Web Inspector: Assertion hit in Base/Object.js
                    removeEventListener
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: y_soliman at apple.com
                CC: inspector-bugzilla-changes at group.apple.com

Created attachment 461825

  --> https://bugs.webkit.org/attachment.cgi?id=461825&action=review

Test Case

The assertion `console.assert(didDelete, this, eventType, listener, thisObject);` is being hit in `Base/Object.js removeEventListener` when loading the attached test case. (Alternate WebM Player feature is enabled).

Object logged:
```
DOMNodeStyles {_listeners: Multimap, _node: DOMNode, _rulesMap: Map, _stylesMap: Multimap, _matchedRules: [], …}
"dom-node-styles-needs-refresh"
function _handleNodesStylesNeedsRefresh(event) { this._needsVariablesFromInspectedNode = true; }
CSSPropertyNameCompletions {_values: Array, _acceptEmptyPrefix: false, _queryController: null, _cachedSortedPropertyNames: Array, _needsVariablesFromInspectedNode: true}
```

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