bitwise NOT operator did not get recognized properly when used with function and judging statement

[ZsgsDesign]

Given the following code:

int main(){
    int a, b;
    fscanf(input, "%d", &b);
    if(~fscanf(user_output, "%d", &a)) {
        // ...
    }
}

The ~fscanf part inconsistently displayed itself as purple, while when using other operators it displays black for operator and then blues for the function name:

int main(){
    int a, b;
    fscanf(input, "%d", &b);
    if(fscanf(user_output, "%d", &a)) {
        // ...
    }
}

int main(){
    int a, b;
    fscanf(input, "%d", &b);
    if(+fscanf(user_output, "%d", &a)) {
        // ...
    }
}

int main(){
    int a, b;
    fscanf(input, "%d", &b);
    if(-fscanf(user_output, "%d", &a)) {
        // ...
    }
}

Even for bitwise XOR operator ^ the behavior stays the same:

int main(){
    int a, b;
    fscanf(input, "%d", &b);
    if(^fscanf(user_output, "%d", &a)) {
        // ...
    }
}

I believe this caused inconsistency and should be fixed in the future.