[webkit-qt] Strange behavior of image rotation

[chunrong lai]

  I see that my QtWebkit fills the original area with background color after
an image is rotated. The fill behavior is not expected and also not observed
in Chromium. Attach is the webpage and the output screenshot. Is the problem
raised from the WebKit or the (rasterize operations of the) underlined
QtGui? How to fix that?
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