fix: reject axis permutations in isExlusiveTranslation

The old test coupled the off-diagonal check to val != 1.0, so an
off-diagonal entry equal to 1.0 (e.g. an axis permutation) was not
disqualified. Such matrices were misclassified as pure translations and
simplifyAffineGet then rebuilt them from the last column only, silently
dropping the permutation.

Replace the conflated condition with the three explicit rules: the
translation column accepts any value, diagonal entries must be 1, and
off-diagonal entries must be 0. Permutations now fall through to the
lossless generic affine copy.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: 2 people

src/main/java/net/imglib2/realtransform/RealViewsSimplifyUtils.java

@@ -108,7 +108,9 @@ public static boolean isExlusiveTranslation( final AffineGet affineGet )
 			for ( int c = 0; c < n + 1; ++c )
 			{
 				final double val = affineGet.get( r, c );
-				if ( val != 0.0 && ( ( r == c && val != 1.0 ) || ( c != n && val != 1.0 ) ) ) { return false; }
+				if ( c == n ) { continue; } // translation column: any value allowed
+				if ( r == c ) { if ( val != 1.0 ) { return false; } } // diagonal must be 1
+				else if ( val != 0.0 ) { return false; } // off-diagonal must be 0
 			}
 		}