[Webkit-unassigned] [Bug 172349] New: ScrollingStateScrollingNode::ChangedProperty::NumScrollingStateNodeBits is wrongly set

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=172349

            Bug ID: 172349
           Summary: ScrollingStateScrollingNode::ChangedProperty::NumScrol
                    lingStateNodeBits is wrongly set
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fred.wang at free.fr
        Depends on: 133022, 135769, 135994, 144482, 145318

ScrollingStateScrollingNode::ChangedProperty::NumScrollingStateNodeBits was introduced in bug 133022 so that ScrollingStateFrameScrollingNode and ScrollingStateOverflowScrollingNode know the number of bits use for properties in their parent class.

In bug 135769, bug 135994, bug 145318 and bug 144482, new properties were added to ScrollingStateScrollingNode but NumScrollingStateNodeBits was not increased accordingly. This means that there are potential conflicts between these new properties and those of derived classes ScrollingStateFrameScrollingNode and ScrollingStateOverflowScrollingNode. Not sure if we have some concrete use case demonstrating the issue, though.


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=133022
[Bug 133022] Split scrolling tree ScrollingNodes into FrameScrollingNodes and OverflowScrollingNodes
https://bugs.webkit.org/show_bug.cgi?id=135769
[Bug 135769] Implement snapping behavior for iOS
https://bugs.webkit.org/show_bug.cgi?id=135994
[Bug 135994] Implement "proximity" scroll snapping
https://bugs.webkit.org/show_bug.cgi?id=144482
[Bug 144482] Expand test infrastructure to support scrolling tests (Part 4): Scroll Snap Support
https://bugs.webkit.org/show_bug.cgi?id=145318
[Bug 145318] [iOS] scrollIntoViewIfNeeded is not working with scroll-snap points
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