To enable/disable the external resource overlay, simply call:
org.eclipse.emf.facet.infra.browser.uicore.CustomizationManager#setDecorateExternalResources(boolean)
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| with the overlay | without the overlay |
Here is a scenario to check that it works:
EPackage#eFactoryInstance reference have a blue arrow
org.eclipse.emf.facet.infra.browser.uicore.examples.cnf.Activator#init:customizationManager.setDecorateExternalResources(false);