[Webkit-unassigned] [Bug 223744] New: [iOS] Non-native scrolling animations are disabled

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=223744

            Bug ID: 223744
           Summary: [iOS] Non-native scrolling animations are disabled
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mrobinson at webkit.org
                CC: simon.fraser at apple.com

"Non-native" scrolling animations are disabled for iOS even when the RenderLayer specifies that the ScrollAnimator should be used. This is currently implemented via an #ifdef [1]

#if ENABLE(SMOOTH_SCROLLING) && !PLATFORM(IOS_FAMILY)
    if (m_scrollableArea.scrollAnimatorEnabled() && !behavior.contains(ScrollBehavior::NeverAnimate)) {
        m_scrollAnimation->setCurrentPosition(m_currentPosition);
        return m_scrollAnimation->scroll(orientation, granularity, step, multiplier);
    }
#endif


This bug tracks deciding whether or not it makes sense to remove this exception. An example of when this would come into play would be when a keyboard is plugged into an iOS device and the user scrolls via pageup / pagedown or the arrow keys.

1. https://github.com/WebKit/WebKit/blob/3148d6dc25355456915544ce7e6e070c7ebf213a/Source/WebCore/platform/ScrollAnimator.cpp#L103

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