[Webkit-unassigned] [Bug 157934] Web Inspector: Right-clicking in Snapshot's DataGrid throws an exception

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=157934

--- Comment #5 from Matt Baker <mattbaker at apple.com> ---
Revised:

* STEPS TO REPRODUCE:
1. Start and stop a Timeline recording.
2. Select any timeline with nested grid rows. 
3. Right-click a disclosure triangle. Doesn't matter if the row is selected or not.
4. Dismiss popup with ESCAPE.
  => Nothing happens
5. Dismiss popup by clicking a cell in the same row, but a different column.
  => TypeError:​ null is not an object (evaluating 'cell.classList')​ (at DataGrid.js:​2469:​18)​

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