Bug 94367 cannot clear compiler compliance setting at the project level
i200505092010 Cannot disable the Java compiler project-specific preferences for some projects. Steps to reproduce: 1 - check out from CVS a Java project that has project-specific Java compiler settings enabled (example: org.eclipse.core.runtime). 2 - open the properties dialog for the project, select the Java compiler node, disable project-specific Java compiler preferences. 3 - Commit the changes by pressing "Ok" and reopen the properties dialog. It looks like the settings were not saved (project-specific settings are still enabled).
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/OptionsConfigurationBlock.java
} else {
			fManager= container.getWorkingCopyManager();
		}
		
		if (fProject != null) {
			fLookupOrder= new IScopeContext[] {
				new ProjectScope(fProject),
				new InstanceScope(),
				new DefaultScope()
			};
		} else {
			fLookupOrder= new IScopeContext[] {
				new InstanceScope(),
				new DefaultScope()
			};
		}
		
		testIfOptionsComplete(allKeys);
		settingsUpdated();
		
		fCheckBoxes= new ArrayList();
		fComboBoxes= new ArrayList();
		fTextBoxes= new ArrayList(2);
		fLabels= new HashMap();
		fExpandedComposites= new ArrayList();
	}
	
	protected static Key getKey(String plugin, String key) {
		return new Key(plugin, key);
	}