[Webkit-unassigned] [Bug 158342] Overlay with -webkit-overflow-scrolling:touch doesn't become scrollable after added text makes it taller

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=158342

--- Comment #13 from Frédéric Wang (:fredw) <fred.wang at free.fr> ---
(In reply to tahoon from comment #12)
> I managed to repro this without using "position: fixed" in attachment 353703
> [details]. The symptom is the same, but I am not sure if it is the same root
> cause. I've tested on devices as early as iOS 9.3.5. Reproduces up to latest
> version.
> 
> Does not repro if top and left CSS properties are used to position the child
> element instead of translate transform.

Great, thanks for the test case!

As I see the error is very similar, both test cases hit the following code where RenderLayerBacking's scrolling layer is unset. This is making the UIProcess hit the ASSERT in ScrollingTreeScrollingNodeDelegateIOS in debug build.

#0      0x000000072f310a96 in WebCore::RenderLayerCompositor::updateScrollCoordinatedLayer(WebCore::RenderLayer&, WTF::OptionSet<WebCore::LayerScrollCoordinationRole>, WTF::OptionSet<WebCore::RenderLayerCompositor::ScrollingNodeChangeFlags>) at /Users/fred/WebKit/Source/WebCore/./rendering/RenderLayerCompositor.cpp:3848
#1      0x000000072f2f9b91 in WebCore::RenderLayerCompositor::updateScrollCoordinatedStatus(WebCore::RenderLayer&, WTF::OptionSet<WebCore::RenderLayerCompositor::ScrollingNodeChangeFlags>) at /Users/fred/WebKit/Source/WebCore/./rendering/RenderLayerCompositor.cpp:3551
#2      0x000000072f2f61fb in WebCore::RenderLayerBacking::updateGeometry() at /Users/fred/WebKit/Source/WebCore/./rendering/RenderLayerBacking.cpp:1226
#3      0x000000072f2f39eb in WebCore::RenderLayerCompositor::updateCompositingDescendantGeometry(WebCore::RenderLayer&, WebCore::RenderLayer&) at /Users/fred/WebKit/Source/WebCore/./rendering/RenderLayerCompositor.cpp:1841
#4      0x000000072f2f3bbe in WebCore::RenderLayerCompositor::updateCompositingDescendantGeometry(WebCore::RenderLayer&, WebCore::RenderLayer&) at /Users/fred/WebKit/Source/WebCore/./rendering/RenderLayerCompositor.cpp:1864
#5      0x000000072f2f3bbe in WebCore::RenderLayerCompositor::updateCompositingDescendantGeometry(WebCore::RenderLayer&, WebCore::RenderLayer&) at /Users/fred/WebKit/Source/WebCore/./rendering/RenderLayerCompositor.cpp:1864
#6      0x000000072f2c9fe4 in WebCore::RenderLayerBacking::updateAfterLayout(WTF::OptionSet<WebCore::RenderLayerBacking::UpdateAfterLayoutFlags>) at /Users/fred/WebKit/Source/WebCore/./rendering/RenderLayerBacking.cpp:655
#7      0x000000072f2c892b in WebCore::RenderLayer::updateLayerPositions(WebCore::RenderGeometryMap*, WTF::OptionSet<WebCore::RenderLayer::UpdateLayerPositionsFlag>) at /Users/fred/WebKit/Source/WebCore/./rendering/RenderLayer.cpp:907
#8      0x000000072f2c7fbb in WebCore::RenderLayer::updateLayerPositionsAfterLayout(WebCore::RenderLayer const*, WTF::OptionSet<WebCore::RenderLayer::UpdateLayerPositionsFlag>) at /Users/fred/WebKit/Source/WebCore/./rendering/RenderLayer.cpp:805
#9      0x000000072eacb586 in WebCore::FrameView::didLayout(WTF::WeakPtr<WebCore::RenderElement>) at /Users/fred/WebKit/Source/WebCore/./page/FrameView.cpp:1301
#10     0x000000072eac11da in WebCore::FrameViewLayoutContext::layout() at /Users/fred/WebKit/Source/WebCore/./page/FrameViewLayoutContext.cpp:237
#11     0x000000072eab80cc in WebCore::FrameView::updateLayoutAndStyleIfNeededRecursive() at /Users/fred/WebKit/Source/WebCore/./page/FrameView.cpp:4313
#12     0x0000000101774025 in WebKit::WebPage::layoutIfNeeded() at /Users/fred/WebKit/Source/WebKit/WebProcess/WebPage/WebPage.cpp:1461

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