[Webkit-unassigned] [Bug 150913] New: Web Inspector: Uncaught Exception opening inspector - TypeError: Attempted to assign to readonly property.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=150913

            Bug ID: 150913
           Summary: Web Inspector: Uncaught Exception opening inspector -
                    TypeError: Attempted to assign to readonly property.
    Classification: Unclassified
           Product: WebKit
           Version: Other
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: joepeck at webkit.org
                CC: bburg at apple.com, graouts at webkit.org,
                    joepeck at webkit.org, mattbaker at apple.com,
                    nvasilyev at apple.com, timothy at apple.com,
                    webkit-bug-importer at group.apple.com

* SUMMARY
Uncaught Exception opening inspector - TypeError: Attempted to assign to readonly property.

* EXCEPTION
TypeError: Attempted to assign to readonly property.
    replaceContentView — ContentViewContainer.js:229
    _resourceTypeDidChange — ResourceClusterContentView.js:248
    dispatch — Object.js:155
    dispatchEventToListeners — Object.js:162
    associateWithScript — Resource.js:653
    Script — Script.js:42
    scriptDidParse — DebuggerManager.js:531
    scriptParsed — DebuggerObserver.js:37
    dispatchEvent — InspectorBackend.js:382
    _dispatchEvent — InspectorBackend.js:281
    dispatch — InspectorBackend.js:89
    dispatchNextQueuedMessageFromBackend — MessageDispatcher.js:42

* NOTES
BackForwardEntry.js has a "get contentView()" but no "set contentView(x)" so this looks legit.

        // Replace all occurrences of oldContentView with newContentView in the back/forward list.
        for (var i = 0; i < this._backForwardList.length; ++i) {
            if (this._backForwardList[i].contentView === oldContentView)
                this._backForwardList[i].contentView = newContentView; // <-- attempting to set content view.
        }

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