[Webkit-unassigned] [Bug 211449] New: Regression (iOS 13.4): WKWebView.loading is never reset after a Back navigation in an iframe

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=211449

            Bug ID: 211449
           Summary: Regression (iOS 13.4): WKWebView.loading is never
                    reset after a Back navigation in an iframe
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Page Loading
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ajuma at chromium.org
                CC: achristensen at apple.com, beidson at apple.com,
                    cdumez at apple.com

Created attachment 398515

  --> https://bugs.webkit.org/attachment.cgi?id=398515&action=review

Test case

Steps to reproduce:
1. Tap on a link in an iframe, that navigates the iframe (rather than the main frame)
2. Go back

Expected result: After (2) completes, WKWebView.loading becomes NO

Actual result: WKWebView.loading is stuck at YES until the next navigation

On Safari on iOS 13.4, this bug causes the blue loading bar to remain visible after (2) is complete.

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