Bug 111139 Add FORMATTER_INSERT_SPACE_BEFORE_PARENTHESIZED_EXPRESSION_IN_RETURN to the code formatter preference page
This new option should be added in the whitespace section (control statements) of the code formatter preference page. It makes the insertion of a space after the return keyword optional when the following expression is a cast expression, a parenthesized expression, a string literal or prefix expression. For all other types of expressions, the insertion of a space is mandatory.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/formatter/WhiteSpaceOptions.java
private static InnerNode createFunctionCallTree(Map workingValues, InnerNode parent) {
        final InnerNode root= new InnerNode(parent, workingValues, FormatterMessages.WhiteSpaceTabPage_calls); 
        
        createOption(root, workingValues, FormatterMessages.WhiteSpaceTabPage_before_opening_paren, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_BEFORE_OPENING_PAREN_IN_METHOD_INVOCATION, METHOD_CALL_PREVIEW); 
        createOption(root, workingValues, FormatterMessages.WhiteSpaceTabPage_after_opening_paren, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_AFTER_OPENING_PAREN_IN_METHOD_INVOCATION, METHOD_CALL_PREVIEW); 
        createOption(root, workingValues, FormatterMessages.WhiteSpaceTabPage_before_closing_paren, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_BEFORE_CLOSING_PAREN_IN_METHOD_INVOCATION, METHOD_CALL_PREVIEW); 
        createOption(root, workingValues, FormatterMessages.WhiteSpaceTabPage_between_empty_parens, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_BETWEEN_EMPTY_PARENS_IN_METHOD_INVOCATION, METHOD_CALL_PREVIEW); 
        createOption(root, workingValues, FormatterMessages.WhiteSpaceTabPage_calls_before_comma_in_method_args, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_BEFORE_COMMA_IN_METHOD_INVOCATION_ARGUMENTS, METHOD_CALL_PREVIEW); 
        createOption(root, workingValues, FormatterMessages.WhiteSpaceTabPage_calls_after_comma_in_method_args, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_AFTER_COMMA_IN_METHOD_INVOCATION_ARGUMENTS, METHOD_CALL_PREVIEW); 
        createOption(root, workingValues, FormatterMessages.WhiteSpaceTabPage_calls_before_comma_in_alloc, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_BEFORE_COMMA_IN_ALLOCATION_EXPRESSION, ALLOC_PREVIEW); 
        createOption(root, workingValues, FormatterMessages.WhiteSpaceTabPage_calls_after_comma_in_alloc, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_AFTER_COMMA_IN_ALLOCATION_EXPRESSION, ALLOC_PREVIEW); 
        createOption(root, workingValues, FormatterMessages.WhiteSpaceTabPage_calls_before_comma_in_qalloc, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_BEFORE_COMMA_IN_EXPLICIT_CONSTRUCTOR_CALL_ARGUMENTS, CONSTRUCTOR_DECL_PREVIEW); 
        createOption(root, workingValues, FormatterMessages.WhiteSpaceTabPage_calls_after_comma_in_qalloc, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_AFTER_COMMA_IN_EXPLICIT_CONSTRUCTOR_CALL_ARGUMENTS, CONSTRUCTOR_DECL_PREVIEW); 
        return root;
    }
    
    private static InnerNode createBlockTree(Map workingValues, InnerNode parent) {
        final InnerNode root= new InnerNode(parent, workingValues, FormatterMessages.WhiteSpaceTabPage_blocks); 
        
        createOption(root, workingValues, FormatterMessages.WhiteSpaceTabPage_before_opening_brace, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_BEFORE_OPENING_BRACE_IN_BLOCK, BLOCK_PREVIEW); 
        createOption(root, workingValues, FormatterMessages.WhiteSpaceTabPage_after_closing_brace, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_AFTER_CLOSING_BRACE_IN_BLOCK, BLOCK_PREVIEW); 
        return root;
    }
    
    private static InnerNode createSwitchStatementTree(Map workingValues, InnerNode parent) {
        final InnerNode root= new InnerNode(parent, workingValues, FormatterMessages.WhiteSpaceTabPage_switch); 
        
        createOption(root, workingValues, FormatterMessages.WhiteSpaceTabPage_switch_before_case_colon, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_BEFORE_COLON_IN_CASE, SWITCH_PREVIEW); 
        createOption(root, workingValues, FormatterMessages.WhiteSpaceTabPage_switch_before_default_colon, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_BEFORE_COLON_IN_DEFAULT, SWITCH_PREVIEW);