[Webkit-unassigned] [Bug 151030] ASSERTION FAILED: roundedIntPoint(LayoutPoint(rendererMappedResult)) == result in WebCore::RenderGeometryMap::mapToContainer

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=151030

--- Comment #9 from Jack <shihchieh_lee at apple.com> ---
workaround:

-void RenderGeometryMap::stepInserted(const RenderGeometryMapStep& step)
+void RenderGeometryMap::stepInserted(RenderGeometryMapStep& step)
 {
     // RenderView's offset, is only applied when we have fixed-positions.
-    if (!step.m_renderer->isRenderView())
+    if (!step.m_renderer->isRenderView()) {
+        step.m_accumulatedOffsetCache = m_accumulatedOffset;
         m_accumulatedOffset += step.m_offset;
+    }

 void RenderGeometryMap::stepRemoved(const RenderGeometryMapStep& step)
 {
     // RenderView's offset, is only applied when we have fixed-positions.
     if (!step.m_renderer->isRenderView())
-        m_accumulatedOffset -= step.m_offset;
+        m_accumulatedOffset = step.m_accumulatedOffsetCache;

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