Fix in Propagator::initFieldFromGRP - #15637
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The field normally should not be deleted since this would invalidate the field pointers cached elsewhere (e.g. by the double version of the Propagator if it was requested). Instead, the existing field should be scaled by the newly provided current values. The exception is the marginal case when the scaling is not possible, e.g. when switching from 5kGauss map to 2kGauss (which should be avoided for other reasons). In this case the field will be recreated and the warning will be printed about possible invalidation of cached pointers.
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The field normally should not be deleted since this would invalidate the field pointers cached elsewhere (e.g. by the double version of the Propagator if it was requested). Instead, the existing field should be scaled by the newly provided current values.
The exception is the marginal case when the scaling is not possible, e.g. when switching from a 5 kGauss map to a 2 kGauss (which should be avoided for other reasons). In this case, the field will be recreated, and the warning will be printed about possible invalidation of cached pointers.
This PR overrides #15632