[Webkit-unassigned] [Bug 179072] New: Web Inspector: Canvas Tab: selecting Frame tree element should update preview/slider, does nothing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=179072

            Bug ID: 179072
           Summary: Web Inspector: Canvas Tab: selecting Frame tree
                    element should update preview/slider, does nothing
           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: bburg at apple.com
                CC: inspector-bugzilla-changes at group.apple.com,
                    webkit-bug-importer at group.apple.com,
                    webkit at devinrousso.com

Steps to reproduce:

- Capture a bunch of frames that change slightly, like webkit.org or acko.net animated backgrounds
- Select a frame, go between frames with arrow keys
=> Preview doesn't update, unless going to "initial state"

This is really annoying because I want to quickly find a frame with a particular visual feature or glitch. If I use the slider to try and scrub, then the preview flickers a lot as it needs to show all intermediate clear() calls.

When I select a frame tree element, I would expect it to show the a preview after the final output-affecting command in the frame window. That way I can expand an interesting frame and see how it's built up from an initial clear() call.

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