[Webkit-unassigned] [Bug 57798] New: Tiled Backing Store does not regenerate tiles when it should

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=57798

           Summary: Tiled Backing Store does not regenerate tiles when it
                    should
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Platform
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: carol at webkit.org


If TiledBackingStore::adjustVisibleRect is called when the contents of the Frame/Layer is empty (or possible even when contents is not empty, but smaller in size then the frame that shows it, tiles are generated to cover the contents - (0, 0) sized tiles in case of empty contents, but not the full visible frame.
When the contents changes to occupy the full visible area, tiles are not regenerated, thus the full document cannot be displayed.
See attachment for a fragment of Qt test code that exhibits the behavior, but the problem is not limited to Qt.

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