Wrong application type - tracer says that nano and vim needs session restart

[FrostyX]

Tracer for some reason suggests that I should restart the session to deal with updated nano.

* nano
    Package:     nano
    Description: A small text editor
    Type:        Session
    State:       nano has been started by jkadlcik 33 seconds ago. PID - 5301

    Affected by: 
        nano
            /usr/bin/nano

    How to restart:
        You will have to log out & log in again

[FrostyX]

Seems to be caused by 7ea0157

[elyscape]

It looks like this is caused by the way tracer is detecting sessions. To decide if a process is a session, tracer checks to see if Process.terminal() returns a value. Unfortunately, that's not what Process.terminal() does; if the process is attached to a terminal, it returns the path to the terminal. As a result, anything attached to a terminal will be interpreted as being a session. One potential solution to this would be to do something like this:

@property
def is_session(self):
    terminal = self.terminal()
    if terminal is None:
        return None
    parent = self.parent()
    if parent is None or terminal != parent.terminal():
        return True

With this change, a process is a session if it has a terminal attached and either has no parent or its parent has a different terminal attached. This isn't foolproof logic, but seems better than what is currently implemented.