Window Docking - Should it be done by default?

[dgud]

In my mind the normal operation is to dock windows, thus it should dock without the user
having to know which special operation that needs to be done to do the docking.

Also casual users get a direct feedback that the windows can be docked, if they don't know
that it can't be done, expert users know that or can lookup how to not dock the window.

I have use gimp (an old version) very seldom but from time to time.
I don't remember how to dock the windows and it creates many,
and I get very frustrated every time I use it.
So I will not change the default handling, docking shall be simple it makes the usage experience
better for more people.