Merge branch '21.0-Addition-callbackForEMRangeCuts' into '21.0'

Adds an option to turn on range cuts for gamma processes (conv, phot, compt)

See merge request atlas/athena!20013

Simulation/G4Atlas/G4AtlasApps/python/callbacks.py

@@ -51,3 +51,9 @@ def add_EnergyConservationTest():
     # Enable the energy conservation test action
     simFlags.OptionalUserActionList.addAction(
         'G4UA::EnergyConservationTestTool', ['Event', 'Tracking', 'Step'])
+
+## Range cuts for gamma processes (conv, phot, compt)
+## these are off by default in Geant4
+def turn_on_gamma_range_cuts():
+    from G4AtlasApps.SimFlags import simFlags
+    simFlags.G4Commands += ['/process/em/applyCuts true']

Simulation/SimulationJobOptions/share/g4/preInclude.GammaRangeCuts.py

+# Turn on range cuts for gamma processes (conv, phot, compt)
+
+from G4AtlasApps import callbacks
+callbacks.turn_on_gamma_range_cuts()