[Webkit-unassigned] [Bug 158586] New: Web Inspector: difficult to zoom rendering frames timeline using trackpad

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=158586

            Bug ID: 158586
           Summary: Web Inspector: difficult to zoom rendering frames
                    timeline using trackpad
    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: bburg at apple.com
                CC: bburg at apple.com, joepeck at webkit.org,
                    mattbaker at apple.com, nvasilyev at apple.com,
                    timothy at apple.com, webkit-bug-importer at group.apple.com

Created attachment 280952
  --> https://bugs.webkit.org/attachment.cgi?id=280952&action=review
[MOVIE] jumpy zooming

It should be centered at where the mouse cursor is, but it drifts to the right or left if you are slightly off center. See the video.

I think we need to add or increase the hysteresis to be more up/down left/right than the record-based timelines. This is because those timelines give much faster feedback so you can adjust your trackpad movement easier. By comparison the rendering frames timeline is jumpy.

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