When does an update to a function come into effect?

If I edit an existing function, and save the file, when does that change come into effect, in the following scenarios:

1. Code is not running (easy - the next time the function is called)
2. Code is running
3. Code is running, then hits a breakpoint outside the function/file in question
4. Code is running, then hits a pause() outside the function/file in question (and are there any other functions, e.g. drawnow(), with the same behaviour, if it is different from the norm)
5. Code is running, then hits a breakpoint inside the function/file in question
6. Code is running, then hits a pause() inside the function/file in question

Where in the documentation is this explained?

[Stephen23]

I cannot recall this being explained. I suspect that the function is only updated once MATLAB is idle, but hopefully one of the experienced MATLAB users will have some comment on this.. I am also interested how it works!