Checkstyle incorrectly counts unicode characters

[nrmancuso]

➜  src cat Test.java
public class Test {
    String aaaaaac = "  "; // two spaces
    String aaaaaad = "💩💩"; // two emojis
}

➜  src java -jar checkstyle-8.43-all.jar -t Test.java
CLASS_DEF -> CLASS_DEF [1:0]
|--MODIFIERS -> MODIFIERS [1:0]
|   `--LITERAL_PUBLIC -> public [1:0]
|--LITERAL_CLASS -> class [1:7]
|--IDENT -> Test [1:13]
`--OBJBLOCK -> OBJBLOCK [1:18]
    |--LCURLY -> { [1:18]
    |--VARIABLE_DEF -> VARIABLE_DEF [2:4]
    |   |--MODIFIERS -> MODIFIERS [2:4]
    |   |--TYPE -> TYPE [2:4]
    |   |   `--IDENT -> String [2:4]
    |   |--IDENT -> aaaaaac [2:11]
    |   |--ASSIGN -> = [2:19]
    |   |   `--EXPR -> EXPR [2:21]
    |   |       `--STRING_LITERAL -> "  " [2:21]
    |   `--SEMI -> ; [2:25]
    |--VARIABLE_DEF -> VARIABLE_DEF [3:4]
    |   |--MODIFIERS -> MODIFIERS [3:4]
    |   |--TYPE -> TYPE [3:4]
    |   |   `--IDENT -> String [3:4]
    |   |--IDENT -> aaaaaad [3:11]
    |   |--ASSIGN -> = [3:19]
    |   |   `--EXPR -> EXPR [3:21]
    |   |       `--STRING_LITERAL -> "💩💩" [3:21]
    |   `--SEMI -> ; [3:27]                          // should be 3:25
    `--RCURLY -> } [4:0]

➜  src while read line; do echo -n "$line" | wc -m ; done< Test.java  
19
22
22
1

I would expect the following:

CLASS_DEF -> CLASS_DEF [1:0]
|--MODIFIERS -> MODIFIERS [1:0]
|   `--LITERAL_PUBLIC -> public [1:0]
|--LITERAL_CLASS -> class [1:7]
|--IDENT -> Test [1:13]
`--OBJBLOCK -> OBJBLOCK [1:18]
    |--LCURLY -> { [1:18]
    |--VARIABLE_DEF -> VARIABLE_DEF [2:4]
    |   |--MODIFIERS -> MODIFIERS [2:4]
    |   |--TYPE -> TYPE [2:4]
    |   |   `--IDENT -> String [2:4]
    |   |--IDENT -> aaaaaac [2:11]
    |   |--ASSIGN -> = [2:19]
    |   |   `--EXPR -> EXPR [2:21]
    |   |       `--STRING_LITERAL -> "  " [2:21]
    |   `--SEMI -> ; [2:25]
    |--VARIABLE_DEF -> VARIABLE_DEF [3:4]
    |   |--MODIFIERS -> MODIFIERS [3:4]
    |   |--TYPE -> TYPE [3:4]
    |   |   `--IDENT -> String [3:4]
    |   |--IDENT -> aaaaaad [3:11]
    |   |--ASSIGN -> = [3:19]
    |   |   `--EXPR -> EXPR [3:21]
    |   |       `--STRING_LITERAL -> "💩💩" [3:21]
    |   `--SEMI -> ; [3:25]
    `--RCURLY -> } [4:0]

[nrmancuso]

Fixed via #10280:

➜  src cat Test.java
public class Test {
    String aaaaaac = "  "; // two spaces
    String aaaaaad = "💩💩"; // two emojis
}

➜  src java -jar ~/IdeaProjects/checkstyle/target/checkstyle-9.0-SNAPSHOT-all.jar -t Test.java
CLASS_DEF -> CLASS_DEF [1:0]
|--MODIFIERS -> MODIFIERS [1:0]
|   `--LITERAL_PUBLIC -> public [1:0]
|--LITERAL_CLASS -> class [1:7]
|--IDENT -> Test [1:13]
`--OBJBLOCK -> OBJBLOCK [1:18]
    |--LCURLY -> { [1:18]
    |--VARIABLE_DEF -> VARIABLE_DEF [2:4]
    |   |--MODIFIERS -> MODIFIERS [2:4]
    |   |--TYPE -> TYPE [2:4]
    |   |   `--IDENT -> String [2:4]
    |   |--IDENT -> aaaaaac [2:11]
    |   |--ASSIGN -> = [2:19]
    |   |   `--EXPR -> EXPR [2:21]
    |   |       `--STRING_LITERAL -> "  " [2:21]
    |   `--SEMI -> ; [2:25]
    |--VARIABLE_DEF -> VARIABLE_DEF [3:4]
    |   |--MODIFIERS -> MODIFIERS [3:4]
    |   |--TYPE -> TYPE [3:4]
    |   |   `--IDENT -> String [3:4]
    |   |--IDENT -> aaaaaad [3:11]
    |   |--ASSIGN -> = [3:19]
    |   |   `--EXPR -> EXPR [3:21]
    |   |       `--STRING_LITERAL -> "💩💩" [3:21]
    |   `--SEMI -> ; [3:25]
    `--RCURLY -> } [4:0]