When there are empty lines in the code, the value of DiffLine.Number is inaccurate

[lucasKone]

source code
`
@@ -3,11 +3,7 @@
const Name = "test"

func Add(x int, y int) int {
if x > 3 {
return x - y
} else {
return x + y
}
return x + y
}
`

You can see from the results：
const Name = "veitch" ---> DiffLine.Number is 3
"func Add(x int, y int) int {" ---> DiffLine.Number is 4,

but the position of "func Add(x int, y int) int {" in the source code is 5