[Webkit-unassigned] [Bug 168212] New: Web Inspector: Assertion failed: !this._items.has(item) (at Collection.js:50)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=168212

            Bug ID: 168212
           Summary: Web Inspector: Assertion failed:
                    !this._items.has(item) (at Collection.js:50)
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bburg at apple.com
                CC: inspector-bugzilla-changes at group.apple.com

Stack trace:

[Error] Assertion Failed
    add (Collection.js:50)
    _scriptWasAdded (ResourceSidebarPanel.js:324)
    dispatch (Object.js:170)
    dispatchEventToListeners (Object.js:177)
    _debugUIEnabledDidChange (DebuggerManager.js:1190)
    dispatch (Object.js:170)
    dispatchEventToListeners (Object.js:177)
    (anonymous function) (Bootstrap.js:58)
    dispatch (Object.js:170)
    dispatchEventToListeners (Object.js:177)
    value (Setting.js:91)
    (anonymous function) (Bootstrap.js:33)
    _handleKeyDown (KeyboardShortcut.js:84)

Steps to reproduce:

1. Use an engineering build
2. Toggle DebugUI on and off (cmd-opt-shift-d)

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