[Webkit-unassigned] [Bug 92711] New: Webpage finishes loading, but does not repaint the page in the window, continues showing previous page

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=92711

           Summary: Webpage finishes loading, but does not repaint the
                    page in the window, continues showing previous page
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
        OS/Version: Mac OS X 10.8
            Status: UNCONFIRMED
          Severity: Major
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: simX_other at mac.com


I recently started having this really annoying bug after upgrading to OS X 10.8 Mountain Lion and Safari 6.0.

The symptoms are that at some unspecified time, and for some unspecified reason, clicking on links causes the linked page to load completely in WebKit, but the previous page continues to be displayed even though the progress indicator in the address bar indicates that the new page has completely loaded.  It seems that that specific tab decides to stop repainting regardless of what you do, or if you attempt to reload the page in order to force a repaint.  The previous page is always displayed.  You can even click links from the new page (i.e.: the links that are actually displayed onscreen are nonfunctional, and clicking in places where new links *would* be displayed in the new page causes those links to load as well, but no change in the displayed page even after loading).

This bug always seems to be accompanied by this line in the Console:

30/07/12 22:30:50,816 SafariForWebKitDevelopment[1959]: CGContextClipToRect: invalid context 0x0

In addition, I have a set of steps that can always reproduce this bug.  Unfortunately, it's with my mobile banking site (aren't they always), so I can't supply a URL/username/password to reproduce the issue, but I can describe it and provide debug information if requested.  (Basically, I load my mobile banking site, click on a link that opens a pop up -- I have to turn off pop-up blocking -- which opens in a new tab, as per my settings.  Then I switch back to the previous tab, and the bug manifests itself -- the page from which the popup was triggered is now stuck in this always-displayed state.)

You can "workaround" the issue by closing the tab, and reopening the page in a new tab.

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