<html>
<head>
<base href="https://bugs.webkit.org/" />
</head>
<body>
<p>
<div>
<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Make it possible to test non-stable-state scrolling on iOS"
href="https://bugs.webkit.org/show_bug.cgi?id=164905#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Make it possible to test non-stable-state scrolling on iOS"
href="https://bugs.webkit.org/show_bug.cgi?id=164905">bug 164905</a>
from <span class="vcard"><a class="email" href="mailto:simon.fraser@apple.com" title="Simon Fraser (smfr) <simon.fraser@apple.com>"> <span class="fn">Simon Fraser (smfr)</span></a>
</span></b>
<pre>The source of the flakiness is that sometimes TileController::adjustTileCoverageRect() has CoverageForVisibleArea and sometimes CoverageForVerticalScrolling. That's affected by FrameView::speculativeTilingEnabled() which is in turn affected by FrameView::wasScrolledByUser(). FrameView:: wasScrolledByUser() is being set via EventHandler::sendScrollEvent() (why?). This is called from FrameView::scrollPositionChanged(), which uses the eventThrottlingDelay() from WebKit2.
There are also timers at various points in this chain. It's all very hard to get stable for testing.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>