[Webkit-unassigned] [Bug 187523] New: WKWebView.backForwardList.currentItem is incorrect after canceled back/forward navigation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=187523

            Bug ID: 187523
           Summary: WKWebView.backForwardList.currentItem is incorrect
                    after canceled back/forward navigation
           Product: WebKit
           Version: Safari 11
          Hardware: iPhone / iPad
                OS: iOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Page Loading
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: danyao at chromium.org
                CC: beidson at apple.com

Created attachment 344701

  --> https://bugs.webkit.org/attachment.cgi?id=344701&action=review

Minimal example to reproduce the bug

For back/forward navigation, WebKit's URL and history state are updated before the |webView:decidePolicyForNavigationAction| callback. If the embedder returns WKNavigationActionPolicyCancel, only the URL change is undone, but not the WKWebView.backForwardList.currentItem change.

Steps to reproduce:
1. Navigate to a URL in WKWebView, e.g. https://wikipedia.org
2. Navigate to a second URL: e.g. https://apple.com
3. Go back
4. In |webView:decidePolicyForNavigationAction|, return WKNavigationActionPolicyCancel
5. Observe WKWebView.URL and WKWebView.backForwardList.currentItem.URL in URL KVO

Expected result: both WKWebView.URL and WKWebView.backForwardList.currentItem.URL are https://apple.com
Observed result: WKWebView.URL is https://apple.com. WKWebView.backForwardList.currentItem.URL is https://wikipedia.org.

The attached WKWebView project runs through the above states and logs the URLs to debug log.

The history state is corrected after starting a new navigation. So this may be a discrepancy between the WebProcess and UIProcess.

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