[Webkit-unassigned] [Bug 167649] New: [Cocoa] Assertion failure in contentZoomScale(WKWebView *) (scale == [webView->_scrollView zoomScale]) in iOS Mail

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=167649

            Bug ID: 167649
           Summary: [Cocoa] Assertion failure in
                    contentZoomScale(WKWebView *) (scale ==
                    [webView->_scrollView zoomScale]) in iOS Mail
    Classification: Unclassified
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Keywords: NeedsRadar
          Severity: Normal
          Priority: P2
         Component: WebKit2
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mitz at webkit.org
                CC: simon.fraser at apple.com

Running the iOS Mail app with a Debug build of WebKit, some of its web views used for message display are constantly failing the ASSERT(scale == [webView->_scrollView zoomScale]) in WKWebView.mm’s contentZoomScale(WKWebView *). In a typical example, one sees

(lldb) p scale
(CGFloat) $0 = 0.25
(lldb) p [(UIScrollView*)webView->_scrollView.m_ptr zoomScale]
(CGFloat) $1 = 1

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