[Webkit-unassigned] [Bug 50373] New: Sub-Frame content is not updated when scrolling in certain circumstances

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=50373

           Summary: Sub-Frame content is not updated when scrolling in
                    certain circumstances
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebKit Qt
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: thomas.thrainer at 4tiitoo.com


Created an attachment (id=75355)
 --> (https://bugs.webkit.org/attachment.cgi?id=75355&action=review)
Patch wich fixes the problem, but very inefficiently

Steps to reproduce:
 * Start QtTestBrowser
 * Enable QGraphicsWebView
 * Enable Accelerated Compositing (not sure if that's needed)
 * Enable Resizes to Contents Mode (not sure if that's needed)
 * Enable Tiled Backing Store (needed)
 * go to images.google.com
 * Search for asdf
 * Click on one of the result images, make sure that the browser window is quite small
 * Google will display an iFrame in the lower part of the screen
 * If you try to scroll the iFrame content, only the scroll bar is updated, but not the content of the frame

I attach a patch which fixes the bug, but which obviously is very inefficient.

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