Fix inconsistent unknown option parsing

- Fix an issue where unknown option is wrongly
  lexed as an argument if it's later than an known
  valid option.
- Essentially if `arg1` is only valid option
  `--arg1 value1 --arg2 value2` would not complain
  about `arg2`.
- Fixes #1120

spring-shell-core/src/main/java/org/springframework/shell/command/parser/Lexer.java

@@ -222,7 +222,13 @@ public interface Lexer {
 					}
 				}
 				else if (isLastTokenOfType(tokenList, TokenType.ARGUMENT)) {
-					tokenList.add(Token.of(argument, TokenType.ARGUMENT, i2));
+					int decuceArgumentStyle = decuceArgumentStyle(argument);
+					if (decuceArgumentStyle < 0) {
+						tokenList.add(Token.of(argument, TokenType.ARGUMENT, i2));
+					}
+					else {
+						tokenList.add(Token.of(argument, TokenType.OPTION, i2));
+					}
 				}
 
 			}