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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/173583">173583</a></dd>
<dt>Author</dt> <dd>lforschler@apple.com</dd>
<dt>Date</dt> <dd>2014-09-12 15:48:06 -0700 (Fri, 12 Sep 2014)</dd>
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<h3>Log Message</h3>
<pre>Merged <a href="http://trac.webkit.org/projects/webkit/changeset/173573">r173573</a>.  &lt;rdar://problem/18314597&gt;</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#branchessafari6001branchSourceWebKit2ChangeLog">branches/safari-600.1-branch/Source/WebKit2/ChangeLog</a></li>
<li><a href="#branchessafari6001branchSourceWebKit2UIProcessmacViewGestureControllerMacmm">branches/safari-600.1-branch/Source/WebKit2/UIProcess/mac/ViewGestureControllerMac.mm</a></li>
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<h3>Diff</h3>
<a id="branchessafari6001branchSourceWebKit2ChangeLog"></a>
<div class="modfile"><h4>Modified: branches/safari-600.1-branch/Source/WebKit2/ChangeLog (173582 => 173583)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-600.1-branch/Source/WebKit2/ChangeLog        2014-09-12 22:41:09 UTC (rev 173582)
+++ branches/safari-600.1-branch/Source/WebKit2/ChangeLog        2014-09-12 22:48:06 UTC (rev 173583)
</span><span class="lines">@@ -1,3 +1,26 @@
</span><ins>+2014-09-12  Lucas Forschler  &lt;lforschler@apple.com&gt;
+
+        Merge r173573
+
+    2014-09-12  Tim Horton  &lt;timothy_horton@apple.com&gt;
+
+            Flash of page scrolled to wrong origin before restoring scroll position after swiping back to CNN front page from an article
+            https://bugs.webkit.org/show_bug.cgi?id=136788
+            &lt;rdar://problem/18314597&gt;
+
+            Reviewed by Sam Weinig.
+
+            * UIProcess/mac/ViewGestureControllerMac.mm:
+            (WebKit::ViewGestureController::didHitRenderTreeSizeThreshold):
+            (WebKit::ViewGestureController::didFirstVisuallyNonEmptyLayoutForMainFrame):
+            Always wait until didFinishLoadForMainFrame or didSameDocumentNavigationForMainFrame
+            before removing the snapshot, because otherwise we don't know if the scroll
+            position has been restored yet.
+
+            We should revisit this at some point, because it should be possible to
+            determine if the scroll position has been restored appropriately, but for
+            now it is safest to restore the antique behavior.
+
</ins><span class="cx"> 2014-08-29  Lucas Forschler  &lt;lforschler@apple.com&gt;
</span><span class="cx"> 
</span><span class="cx">         Merge r173121
</span></span></pre></div>
<a id="branchessafari6001branchSourceWebKit2UIProcessmacViewGestureControllerMacmm"></a>
<div class="modfile"><h4>Modified: branches/safari-600.1-branch/Source/WebKit2/UIProcess/mac/ViewGestureControllerMac.mm (173582 => 173583)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-600.1-branch/Source/WebKit2/UIProcess/mac/ViewGestureControllerMac.mm        2014-09-12 22:41:09 UTC (rev 173582)
+++ branches/safari-600.1-branch/Source/WebKit2/UIProcess/mac/ViewGestureControllerMac.mm        2014-09-12 22:48:06 UTC (rev 173583)
</span><span class="lines">@@ -691,8 +691,10 @@
</span><span class="cx"> 
</span><span class="cx">     m_swipeWaitingForRenderTreeSizeThreshold = false;
</span><span class="cx"> 
</span><del>-    if (!m_swipeWaitingForVisuallyNonEmptyLayout)
-        removeSwipeSnapshotAfterRepaint();
</del><ins>+    if (!m_swipeWaitingForVisuallyNonEmptyLayout) {
+        // FIXME: Ideally we would call removeSwipeSnapshotAfterRepaint() here, but sometimes
+        // scroll position isn't done restoring until didFinishLoadForFrame, so we flash the wrong content.
+    }
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> void ViewGestureController::didFirstVisuallyNonEmptyLayoutForMainFrame()
</span><span class="lines">@@ -702,9 +704,10 @@
</span><span class="cx"> 
</span><span class="cx">     m_swipeWaitingForVisuallyNonEmptyLayout = false;
</span><span class="cx"> 
</span><del>-    if (!m_swipeWaitingForRenderTreeSizeThreshold)
-        removeSwipeSnapshotAfterRepaint();
-    else {
</del><ins>+    if (!m_swipeWaitingForRenderTreeSizeThreshold) {
+        // FIXME: Ideally we would call removeSwipeSnapshotAfterRepaint() here, but sometimes
+        // scroll position isn't done restoring until didFinishLoadForFrame, so we flash the wrong content.
+    } else {
</ins><span class="cx">         m_swipeWatchdogAfterFirstVisuallyNonEmptyLayoutTimer.startOneShot(swipeSnapshotRemovalWatchdogAfterFirstVisuallyNonEmptyLayoutDuration.count());
</span><span class="cx">         m_swipeWatchdogTimer.stop();
</span><span class="cx">     }
</span></span></pre>
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