active-window
                                
                                
                                
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                        Update linux app name
Right now the Linux window.app contains a string like:  "gnome-terminal-server", "Gnome-terminal" (including the ").
It seems that there is an app name and an app class name here's my reference.
This PR makes the window.app contain (in that case): gnome-terminal-server
And also it adds an additional window.appClass that contains (in that case): Gnome-terminal.
The additional window.appClass is only set when the system is Linux. If you want, I can set it to an empty string in Windows an Mac, just to have a common interface and avoid compatibility issues.