[Webkit-unassigned] [Bug 198004] New: Web Inspector: Storage tab crashes easily when adding new local/session storage entries.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=198004

            Bug ID: 198004
           Summary: Web Inspector: Storage tab crashes easily when adding
                    new local/session storage entries.
           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: ross.kirsling at sony.com
                CC: inspector-bugzilla-changes at group.apple.com

(Evidently somebody noticed this a year ago on our end but it never got reported upstream... :sad_panda:)

Steps:
1. Open Storage tab
2. Double-click an empty row
3. Enter text for key
4. Press tab
5. Enter text for value
6. Press tab

Result:
> TypeError:​ undefined is not an object (evaluating 'this._editingNode._element.children')​ (at DataGrid.js:​523:​49)​
>     _startEditingNodeAtColumnIndex @ DataGrid.js:​523:​49
>     moveToNextCell @ DataGrid.js:​596:​52
>     _editingCommitted @ DataGrid.js:​606:​28
>     _editingCommitted @ [native code]​
>     editingCommitted @ EditingSupport.js:​197:​26
>     blurEventListener @ EditingSupport.js:​143:​30

Notes:
- After step 4, the text for the key disappears.
- If you press enter instead of tab in step 6, the crash does not occur and the text for the key re-appears, but now the text for the value disappears.

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