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Øyvind "pippin" Kolås authored
The code in the op was rigged up with the intention of doing both forward and reverse transforms; original work on the op stopped when the panorama-preview part worked - leaving much of the code needed for reverse in place. This commit refactors and cleans up the reverse case, but doesn't quit make it work yet - a bug has been filed about this remaining work in bug #795042.
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