Bug 788461 - Selection with a Fixed size is created with an ...
... off-by one size in special cases SIGNED_ROUND(), which is used by GimpToolRectangle, among other things, used to round negative values which lie exactly between two integers, i.e., -foo.5, down. This could lead to the rectangle being one pixel bigger than expected, in either dimension, when one of its edges had a negative coordinate, and the opposite edge had a positive coordinate. Fix SIGNED_ROUND() to always round such values up, regardless of sign.
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