Highlighting in IDE is not updated on edit

### Environment

* Operating System (e.g. Ubuntu 16.04 x64): Windows 10 Version 1909
* IDE Version (e.g. CLion 2016.3.2): CLion 2020.1
* Cppcheck executable version (`cppcheck --version`): 1.90
* Cppcheck plugin version: 1.4.2

### Expected behaviour

When editing the code the Cppcheck highlighting should update accordingly.

### Actual behaviour

The highlight is not correct until the file has been closed and opened again.

### Steps to reproduce the behaviour

```cpp
#include

template
void f(T t) {
(void)t;
}

class A
{
private:
std::string s_{"str"};
};

static void f2(A a)
{
(void)a;
}

int main()
{
A a;
//f(a); // un-comment for warning template function f()
f2(a);

return 0;
}
```

If you un-comment that line it should show a warning in the template function, but no error is shown. If you close the file and open it again the warning will be shown. Same when you comment it the warning doesn't go away.