[Webkit-unassigned] [Bug 179927] Text cursor blinks outside of input box after scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=179927

Frédéric Wang (:fredw) <fred.wang at free.fr> changed:

           What    |Removed                     |Added
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                 CC|                            |fred.wang at free.fr

--- Comment #1 from Frédéric Wang (:fredw) <fred.wang at free.fr> ---
I can confirm the bug on trunk.

@Danyao: I've actually been studying stack traces to re-position the fixed node for other bugs and it is:

WebCore::ScrollingStateFixedNode::reconcileLayerPositionForViewportRect
WebCore::AsyncScrollingCoordinator::reconcileViewportConstrainedLayerPositions
WebCore::AsyncScrollingCoordinator::reconcileScrollingState
WebKit::WebPage::updateVisibleContentRects

Also IIRC AsyncScrollingCoordinator::reconcileScrollingState is called 
from WebCore::AsyncScrollingCoordinator::updateScrollPositionAfterAsyncScroll if you perform a programmatic scroll of the main frame (instead of user interaction).

WebCore::AsyncScrollingCoordinator::updateScrollPositionAfterAsyncScroll is also called when doing user interaction in "overflow: auto; webkit-overflow-scrolling: touch" nodes and interestingly in that case we tell WebEditorClient that the overflow scroll position has changed.

Maybe you can try to compare your testcase using scrollingElement.scrollTop = ... or "overflow: auto; webkit-overflow-scrolling: touch" nodes and see whether you get the same issue?

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