[Webkit-unassigned] [Bug 161880] New: With a WKWebView's scroll view, a negative content offset y value is reset to 0 if the web view's frame height is increased.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=161880

            Bug ID: 161880
           Summary: With a WKWebView's scroll view, a negative content
                    offset y value is reset to 0 if the web view's frame
                    height is increased.
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: iOS
                OS: iOS 9.3
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: gchatz at chromium.org

Created attachment 288628
  --> https://bugs.webkit.org/attachment.cgi?id=288628&action=review
Test app

Summary:
With a WKWebView's scroll view, a negative content offset y value is reset to 0 if the web view's frame height is increased.

Steps to Reproduce:
1. Set content offset of a WKWebView to a negative value.
2. Set the WKWebView's height to a bigger value.
3. Observe the new content offset of the web view.
(See test app)

Expected Results:
The content offset should stay negative.

Actual Results:
The content offset is changed to 0.

Version:
Since at least iOS 9. Present in iOS 10.

Configuration:
iPhones and iPads

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