The very "basic" version of what you are looking for would be:
Exec=/bin/bash -c "sleep 0.25&&xdotool key Shift_L+Super_L+w"
How to use
You would have to install
xdotool (as mentioned by @Takkat):
sudo apt-get install xdotool
Then paste the code above into an empty file, save it as (e.g.):
- if you want to run it from your desktop: make it executable and run it by double-click
- If you want to run it from the Launcher: move it into
~/.local/share/applications, drag it from there on to the Launcher.
With xdotool, you can simulate keyboard strokes. The command to run your keyboard combination by
xdotool key Shift_L+Super_L+w
Why the pause of
Without the pause, the script would start while you were double clicking the icon, and break the command.
If you strictly use the starter from the Launcher, the
Exec= line can be:
Exec=/bin/bash -c "xdotool key Shift_L+Super_L+w"
.desktop file is the most (possible) basic version of a
.desktop file. You can "dress" it with an icon, for example, with an
Icon= line, with the path to an icon you'd want to use. More on options here.