[Webkit-unassigned] [Bug 52987] New: Rendering of body outside bounds is broken

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=52987

           Summary: Rendering of body outside bounds is broken
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: joseph at inventivelabs.com.au


The first nightly this bug appeared in was r73429. r73340 exhibits the expected behaviour.

The Monocle ebook reading library utilises the following technique:

* All the content is in a fixed width/height iframe.
* In response to UI events, the document body inside the frame is translated horizontally.

You can see it in effect here: http://things-we-didnt-c2f954.reading.booki.sh. Turning past the first page in recent nightlies shows blank pages. In Safari 5.0.3 it behaves as expected.

The same bug exhibits if the body's scrollLeft is changed rather than its X translation.

My suspicion is that it is caused by the patch to this bug: https://bugs.webkit.org/show_bug.cgi?id=50593

I'm not familiar with WebKit development, but I'm happy to refine this bug report and do further investigation if required — the effect of this bug on us is huge!

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