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      <base href="https://bugs.webkit.org/">
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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 - Crash in WebCore::GraphicsContext::platformContext()"
   href="https://bugs.webkit.org/show_bug.cgi?id=170602">170602</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Crash in WebCore::GraphicsContext::platformContext()
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>Safari Technology Preview
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>URL</th>
          <td>http://substance.io/examples/tangle/
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Unspecified
          </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>WebCore Misc.
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>dieter&#64;komendera.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=306507" name="attach_306507" title="crash log">attachment 306507</a> <a href="attachment.cgi?id=306507&amp;action=edit" title="crash log">[details]</a></span>
crash log

To reproduce:

1) go to <a href="http://substance.io/examples/tangle/">http://substance.io/examples/tangle/</a>
2) click and drag the green number 2050

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   com.apple.WebCore                   0x00000001087a4a67 WebCore::GraphicsContext::platformContext() const + 7
1   com.apple.WebKit                    0x0000000107e41933 WebKit::WebDragClient::startDrag(WebCore::DragImage, WebCore::IntPoint const&amp;, WebCore::IntPoint const&amp;, WebCore::FloatPoint const&amp;, WebCore::DataTransfer&amp;, WebCore::Frame&amp;, WebCore::DragSourceAction) + 239
2   com.apple.WebCore                   0x0000000108c7ea0b WebCore::DragController::doSystemDrag(WebCore::DragImage, WebCore::IntPoint const&amp;, WebCore::IntPoint const&amp;, WebCore::IntRect const&amp;, WebCore::DataTransfer&amp;, WebCore::Frame&amp;, WebCore::DragSourceAction) + 427
3   com.apple.WebCore                   0x0000000108c7dd0f WebCore::DragController::startDrag(WebCore::Frame&amp;, WebCore::DragState const&amp;, WebCore::DragOperation, WebCore::PlatformMouseEvent const&amp;, WebCore::IntPoint const&amp;) + 6207
4   com.apple.WebCore                   0x0000000108939843 WebCore::EventHandler::handleDrag(WebCore::MouseEventWithHitTestResults const&amp;, WebCore::CheckDragHysteresis) + 2467
5   com.apple.WebCore                   0x0000000108cc292a WebCore::EventHandler::handleMouseDraggedEvent(WebCore::MouseEventWithHitTestResults const&amp;, WebCore::CheckDragHysteresis) + 58
6   com.apple.WebCore                   0x00000001088a6db9 WebCore::EventHandler::handleMouseMoveEvent(WebCore::PlatformMouseEvent const&amp;, WebCore::HitTestResult*, bool) + 1337
7   com.apple.WebCore                   0x00000001088a66c0 WebCore::EventHandler::mouseMoved(WebCore::PlatformMouseEvent const&amp;) + 160
8   com.apple.WebKit                    0x0000000107c8eb14 WebKit::WebPage::mouseEvent(WebKit::WebMouseEvent const&amp;) + 612

Safari Technology Preview Release 27 (Safari 10.2, WebKit 12604.1.15.2)</pre>
        </div>
      </p>


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