[Webkit-unassigned] [Bug 142297] New: Web Inspector: assertion failure when selecting timeline data grid nodes without popovers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=142297

            Bug ID: 142297
           Summary: Web Inspector: assertion failure when selecting
                    timeline data grid nodes without popovers
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: burg at cs.washington.edu
                CC: graouts at webkit.org, joepeck at webkit.org,
                    jonowells at apple.com, mattbaker at apple.com,
                    nvasilyev at apple.com, timothy at apple.com,
                    webkit-bug-importer at group.apple.com

Created attachment 247873
  --> https://bugs.webkit.org/attachment.cgi?id=247873&action=review
stack trace

It seems that we sometimes try to hide the popover when it's not being shown.

Steps to reproduce:

1. Collect some layout timeline records with and without stack traces
2. Select layout timeline panel
3. Select a record
4. Use keyboard up/down arrows to quickly switch the selected record

It seems that this assertion failure happens when either:

a) switching from row with stack trace (popover open) to a row with no stack trace
b) switching from row with stack trace (popover not open) to a row with stack trace

The latter case is triggered by pressing up-up quickly enough to change selections before the slight delay in popover appearing.

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