[Webkit-unassigned] [Bug 157612] New: Web Inspector: 11% of time in TimelineRecording spent updating DataGrid that is not visible

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=157612

            Bug ID: 157612
           Summary: Web Inspector: 11% of time in TimelineRecording spent
                    updating DataGrid that is not visible
    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: joepeck at webkit.org
                CC: bburg at apple.com, graouts at webkit.org,
                    joepeck at webkit.org, mattbaker at apple.com,
                    nvasilyev at apple.com, timothy at apple.com,
                    webkit-bug-importer at group.apple.com

* SUMMARY
11% of time in TimelineRecording spent updating DataGrid that is not visible

DataGrid._updateVisibleRows is taking up 11% of time, including many forced layouts, when the DataGrid is not even visible.

In this case, the TimelineRecordingProgressView is showing, but in other cases, it likely isn't updating unless there is some kind of resize.

* STEPS TO REPRODUCE
1. Inspect theverge.com
2. Show Timeline tab
3. Show Scripts > Call Trees
4. Start Recording
  => Lots of time and forced layouts in DataGrid._updateVisibleRows

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