A simple bash script that ensures a new instance of Sublime Text 3 is launched per workspace.
NOTE: This has been tested in Cinnamon as well as Ubuntu/Gnome. Chances are if you're not using one of these, you'll have to adapt this.
Needs wmctrl to work. Also, Sublime Text 3 :)
Copy the script anywhere that's in your PATH.
Add a new launcher for the script in ~/.local/share/applications (one is provided in Launcher/.local/share/applications).
Use this new launcher instead of the default Sublime Text launcher to open your text files