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David Gobbi authored
The ForwardTransformPoint method was missing a "!" in a null pointer check, causing the transform to perform an identity transform. The tests for this class did not cover this code path, even though it is the most common path in the general usage of this class. A new test has been added, and an old test has been re-enabled. Also, add the missing GetDisplacementScale method. Change-Id: I3cc21fda11e4c4f0a83dc020e0e9968086246d45
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