When I double click to open a file, a new Emacs session is launched, like this:
So now there are two sessions. What I want to do is that when I double click a file, it will be opened in another window in the existing session, so there is only one session. I know I can use
C-x C-f to open a file, but the point is "double click".
I am using emacs 25.1.1, linuxmint 18.1. How can I do this?