[Webkit-unassigned] [Bug 204473] New: Web Inspector: Uncaught Exception: TypeError: undefined is not an object (evaluating 'target.PageAgent.getCompositingBordersVisible')

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=204473

            Bug ID: 204473
           Summary: Web Inspector: Uncaught Exception: TypeError:
                    undefined is not an object (evaluating
                    'target.PageAgent.getCompositingBordersVisible')
           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: drousso at apple.com
                CC: inspector-bugzilla-changes at group.apple.com

Uncaught Exception in Web Inspector.

Steps to Reproduce:
1. inspect any page
2. go to the Layers Tab
3. close Web Inspector
4. open Web Inspector

Uncaught Exceptions:
-----------------------
 - TypeError: undefined is not an object (evaluating 'target.PageAgent.getCompositingBordersVisible') (at Layers3DContentView.js:426:25)
    _updateCompositingBordersButtonState @ Layers3DContentView.js:426:25
    shown @ Layers3DContentView.js:83:50
    prepareToShow @ BackForwardEntry.js:84:35
    _showEntry @ ContentViewContainer.js:456:28
    showBackForwardEntryForIndex @ ContentViewContainer.js:166:28
    showContentView @ ContentViewContainer.js:142:42
    shown @ LayersTabContentView.js:73:44
    prepareToShow @ BackForwardEntry.js:84:35
    _showEntry @ ContentViewContainer.js:456:28
    showBackForwardEntryForIndex @ ContentViewContainer.js:166:28
    showContentView @ ContentViewContainer.js:142:42
    _tabBarItemSelected @ TabBrowser.js:240:55
    dispatch @ Object.js:165:30
    dispatchEventToListeners @ Object.js:172:17
    selectedTabBarItem @ LegacyTabBar.js:387:38
    ? @ Main.js:510:14
-----------------------

Notes:
Inspected URL:        (unknown)
Loading completed:    false
Frontend User Agent:  Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/605.1.15 (KHTML, like Gecko)

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