[Webkit-unassigned] [Bug 73920] New: Tiled backing store failing to update view under certain conditions

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=73920

           Summary: Tiled backing store failing to update view under
                    certain conditions
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebKit Qt
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bruno.de_oliveira at basyskom.de


Created an attachment (id=118039)
 --> (https://bugs.webkit.org/attachment.cgi?id=118039&action=review)
QtWebKit testcase for QGraphicsWebView

When loading a new webpage on a QGraphicsWebView with Tiled Backing Store option enabled, some dirty tiles from the previous webpage are still seen when scrolling down the webpage. The tiles are only updated after a scale change. A testcase is provided as a patch. Desktop and Harmattan device results are the same:

FAIL!  : tst_QGraphicsWebView::widgetsRenderingAfterScale(3 NoResize, TBS, NoFrozen, BeforeScene) 'email2AfterScrollPixmap.toImage() == email2AfterScalePixmap.toImage()' returned FALSE. ()
   Loc: [tst_qgraphicswebview.cpp(352)]
FAIL!  : tst_QGraphicsWebView::widgetsRenderingAfterScale(4 NoResize, TBS, NoFrozen, AfterScene) 'email2AfterScrollPixmap.toImage() == email2AfterScalePixmap.toImage()' returned FALSE. ()
   Loc: [tst_qgraphicswebview.cpp(352)]
FAIL!  : tst_QGraphicsWebView::widgetsRenderingAfterScale(9 Resize, TBS, NoFrozen, AfterScene) 'email2AfterScrollPixmap.toImage() == email2AfterScalePixmap.toImage()' returned FALSE. ()

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