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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Web Inspector: difficult to zoom rendering frames timeline using trackpad"
   href="https://bugs.webkit.org/show_bug.cgi?id=158586">158586</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Web Inspector: difficult to zoom rendering frames timeline using trackpad
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>WebKit Nightly Build
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Web Inspector
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned&#64;lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>bburg&#64;apple.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>bburg&#64;apple.com, joepeck&#64;webkit.org, mattbaker&#64;apple.com, nvasilyev&#64;apple.com, timothy&#64;apple.com, webkit-bug-importer&#64;group.apple.com
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        </tr></table>
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        <pre>Created <span class=""><a href="attachment.cgi?id=280952" name="attach_280952" title="[MOVIE] jumpy zooming">attachment 280952</a> <a href="attachment.cgi?id=280952&amp;action=edit" title="[MOVIE] jumpy zooming">[details]</a></span>
[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.</pre>
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      </p>
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