Archwiki said: “XFWM4 can ‘tile’ a window automatically when it is moved to an edge of the screen. It does so by resizing it to fit the top half of the screen. “

Reading:
* https://forum.xfce.org/viewtopic.php?id=7405

Screenshot Information
OS: Debian 8.0 Jessie
+ Kernel: x86_64 Linux 3.16.0-4-amd64
+ Resolution: 1024x768
+ WM: Xfwm4
+ WM Theme: Numix
+ GTK Theme: Bluebird [GTK2], Bluebird [GTK3]
+ Icon Theme: hicolor
+ Font: Sans 10
+ Workspace: No miniature view
+ Title Font: Capture It
+ Tiling: Left + Right

debian+xfwm+tiling+minimalist

Note on SS : user vs root.