[iOS] position:fixed inside touch-scrollable overflow is mispositioned

[WebKit-https.git] / Source / WebCore / ChangeLog

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+2017-01-30  Simon Fraser  <simon.fraser@apple.com>
+
+        [iOS] position:fixed inside touch-scrollable overflow is mispositioned
+        https://bugs.webkit.org/show_bug.cgi?id=167604
+        rdar://problem/29500273
+
+        Reviewed by Zalan Bujtas.
+        
+        For layers inside touch-scrollable overflow, RenderLayerBacking::computeParentGraphicsLayerRect() needs
+        to account for the offset from the ancestor compositing layer's origin, to handle scrollable elements with
+        box-shadow, for example.
+        
+        Also make the compositing log output a little easier to read.
+
+        Test: compositing/scrolling/fixed-inside-scroll.html
+
+        * rendering/RenderLayerBacking.cpp:
+        (WebCore::RenderLayerBacking::computeParentGraphicsLayerRect):
+        * rendering/RenderLayerCompositor.cpp:
+        (WebCore::RenderLayerCompositor::logLayerInfo):
+
 2017-01-30  Jer Noble  <jer.noble@apple.com>
 
         NULL-deref crash at PlatformMediaSession::endInterruption