[Webkit-unassigned] [Bug 214611] New: Web Inspector: Sources tab empty, sidebar nonfunctional

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=214611

            Bug ID: 214611
           Summary: Web Inspector: Sources tab empty, sidebar
                    nonfunctional
           Product: WebKit
           Version: Safari 13
          Hardware: All
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: opendarwin at lapcatsoftware.com
                CC: inspector-bugzilla-changes at group.apple.com

Overview:
Under some circumstances, the Sources tab in broken in the Web Inspector. The tab is empty, and the left sidebar button doesn't do anything.

Steps to Reproduce:
1. Open Safari Preferences and set New windows open with: Empty Page
2. Open new window in Safari
3. Select "Inspect Element" from the contextual menu
4. Open https://www.cnn.com
5. Select "Sources" tab

Versions:
This happens with Safari Version 13.1.2 (14609.3.5.1.5) and Safari Technology Preview Release 108 (Safari 13.2, WebKit 14610.1.16.3) on macOS 10.14.6 (18G6020).

Additional Information:
If I inspect the web inspector itself using WebKitDebugDeveloperExtrasEnabled, I see the following errors in the web inspector console for Safari 13.1.2

[Error] TypeError: null is not an object (evaluating 'this._issueMessage.sourceCodeLocation.displayLineNumber')
        _updateTitles (Main.js:18996)
        IssueTreeElement (Main.js:18992:181)
        _addIssue (Main.js:24293)
        _addIssuesForSourceCode (Main.js:24307)
        _addResource (Main.js:24216:161)
        _addResourcesRecursivelyForFrame (Main.js:24218)
        _handleResourceGroupingModeChanged (Main.js:24416)
        SourcesNavigationSidebarPanel (Main.js:24079:100)
        navigationSidebarPanel (Main.js:11832)
        shown (Main.js:12038)
        prepareToShow (Main.js:2920)
        _showEntry (Main.js:16069)
        showBackForwardEntryForIndex (Main.js:16004)
        showContentView (Main.js:15999)
        _tabBarItemSelected (Main.js:9515)
        dispatch (Main.js:188:149)
        dispatchEventToListeners (Main.js:190)
        selectTabBarItem (Main.js:11050:117)
        _handleMouseDown (Main.js:11108)
        _handleMouseDown
[Error] TypeError: undefined is not an object (evaluating 'this.contentBrowser.currentContentView')
        (anonymous function) (Main.js:24194)

And similar for Safari Tech Preview 108:

[Error] TypeError: null is not an object (evaluating 'this._issueMessage.sourceCodeLocation.displayLineNumber')
        _updateTitles (Main.js:18958)
        IssueTreeElement (Main.js:18954:181)
        _addIssue (Main.js:24333)
        _addIssuesForSourceCode (Main.js:24347)
        _addResource (Main.js:24247:161)
        _addResourcesRecursivelyForFrame (Main.js:24249)
        _handleResourceGroupingModeChanged (Main.js:24455)
        SourcesNavigationSidebarPanel (Main.js:24094:100)
        navigationSidebarPanel (Main.js:11711)
        shown (Main.js:11916)
        prepareToShow (Main.js:2925)
        _showEntry (Main.js:16059)
        showBackForwardEntryForIndex (Main.js:15994)
        showContentView (Main.js:15989)
        _tabBarItemSelected (Main.js:9557)
        dispatch (Main.js:189:149)
        dispatchEventToListeners (Main.js:191)
        selectTabBarItem (Main.js:9355:117)
        _handleTabContainerMouseDown (Main.js:9423)
        _handleTabContainerMouseDown
[Error] TypeError: undefined is not an object (evaluating 'this.contentBrowser.currentContentView')
        (anonymous function) (Main.js:24225)

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