[Webkit-unassigned] [Bug 203935] New: Web Inspector: Timelines: add a marker for when a stop was requested

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=203935

            Bug ID: 203935
           Summary: Web Inspector: Timelines: add a marker for when a stop
                    was requested
           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: drousso at apple.com
                CC: inspector-bugzilla-changes at group.apple.com
        Depends on: 196778

After r244195, the Web Inspector frontend doesn't stop updating the current time marker until after it receives all of the corresponding `*.trackingComplete` events.  This means that sometimes, the current time marker can move far past the time at which the stop was requested, such as if there's a blocking script (e.g. <https://wkwebviewtest.surge.sh>).  We should indicate where the stop was requested, as that is often right after a particular issue is reproduced during a timeline recording (rather than have the user try to figure out (or worse, guess) where they stopped).

It's still useful to have the current time marker continue updating, as we should show all the information we have about captured things, such as blocking scripts.


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=196778
[Bug 196778] Web Inspector: Timelines: can't reliably stop/start a recording
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