Bug 40300 Compiler pref page does not disable unavailable preferences [build path]
I20030716 + plug-in export If I set a parent preference to ignore I'd expect that sub-properties get disabled.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/CompilerConfigurationBlock.java
private static final String PREF_LOCAL_VARIABLE_ATTR=  JavaCore.COMPILER_LOCAL_VARIABLE_ATTR;
	private static final String PREF_LINE_NUMBER_ATTR= JavaCore.COMPILER_LINE_NUMBER_ATTR;
	private static final String PREF_SOURCE_FILE_ATTR= JavaCore.COMPILER_SOURCE_FILE_ATTR;
	private static final String PREF_CODEGEN_UNUSED_LOCAL= JavaCore.COMPILER_CODEGEN_UNUSED_LOCAL;
	private static final String PREF_CODEGEN_TARGET_PLATFORM= JavaCore.COMPILER_CODEGEN_TARGET_PLATFORM;
	
	
	private static final String PREF_PB_OVERRIDING_PACKAGE_DEFAULT_METHOD= JavaCore.COMPILER_PB_OVERRIDING_PACKAGE_DEFAULT_METHOD;
	private static final String PREF_PB_METHOD_WITH_CONSTRUCTOR_NAME= JavaCore.COMPILER_PB_METHOD_WITH_CONSTRUCTOR_NAME;
	private static final String PREF_PB_DEPRECATION= JavaCore.COMPILER_PB_DEPRECATION;
	private static final String PREF_PB_HIDDEN_CATCH_BLOCK= JavaCore.COMPILER_PB_HIDDEN_CATCH_BLOCK;
	private static final String PREF_PB_UNUSED_LOCAL= JavaCore.COMPILER_PB_UNUSED_LOCAL;
	private static final String PREF_PB_UNUSED_PARAMETER= JavaCore.COMPILER_PB_UNUSED_PARAMETER;
	private static final String PREF_PB_SIGNAL_PARAMETER_IN_OVERRIDING= JavaCore.COMPILER_PB_UNUSED_PARAMETER_WHEN_OVERRIDING_CONCRETE;
	private static final String PREF_PB_SIGNAL_PARAMETER_IN_ABSTRACT= JavaCore.COMPILER_PB_UNUSED_PARAMETER_WHEN_IMPLEMENTING_ABSTRACT;
	private static final String PREF_PB_SYNTHETIC_ACCESS_EMULATION= JavaCore.COMPILER_PB_SYNTHETIC_ACCESS_EMULATION;
	private static final String PREF_PB_NON_EXTERNALIZED_STRINGS= JavaCore.COMPILER_PB_NON_NLS_STRING_LITERAL;
	private static final String PREF_PB_ASSERT_AS_IDENTIFIER= JavaCore.COMPILER_PB_ASSERT_IDENTIFIER;
	private static final String PREF_PB_MAX_PER_UNIT= JavaCore.COMPILER_PB_MAX_PER_UNIT;
	private static final String PREF_PB_UNUSED_IMPORT= JavaCore.COMPILER_PB_UNUSED_IMPORT;
	private static final String PREF_PB_UNUSED_PRIVATE= JavaCore.COMPILER_PB_UNUSED_PRIVATE_MEMBER;
	private static final String PREF_PB_STATIC_ACCESS_RECEIVER= JavaCore.COMPILER_PB_STATIC_ACCESS_RECEIVER;
	private static final String PREF_PB_NO_EFFECT_ASSIGNMENT= JavaCore.COMPILER_PB_NO_EFFECT_ASSIGNMENT;
	private static final String PREF_PB_CHAR_ARRAY_IN_CONCAT= JavaCore.COMPILER_PB_CHAR_ARRAY_IN_STRING_CONCATENATION;
	private static final String PREF_PB_POSSIBLE_ACCIDENTAL_BOOLEAN_ASSIGNMENT= JavaCore.COMPILER_PB_POSSIBLE_ACCIDENTAL_BOOLEAN_ASSIGNMENT;
	private static final String PREF_PB_LOCAL_VARIABLE_HIDING= JavaCore.COMPILER_PB_LOCAL_VARIABLE_HIDING;