fixup: make a deep copy on a need-to basis

python/lsst/meas/extensions/shapeHSM/_hsm_higher_moments.py

@@ -285,10 +285,13 @@ def measure(self, record, exposure):
         bitValue = exposure.mask.getPlaneBitMask(self.config.badMaskPlanes)
         badpix = (exposure.mask[bbox].array & bitValue) != 0
 
+        # Make a deep copy only if any of the pixels are masked are bad ones.
+        deep = badpix.any()
+
         # Measure all the moments together to save time
         try:
             hm_measurement = self._calculate_higher_order_moments(
-                exposure.image[bbox],
+                exposure.image[bbox].copy(deep=deep),
                 center,
                 M,
                 badpix,