i3: Add binding to switch between visible monitors

I have not tested this with more than 2 monitors. I am unsure if the
binding will cycle through them or just between two.

.config/i3/config

@@ -97,6 +97,12 @@ bindsym $mod+8 workspace $ws8
 bindsym $mod+9 workspace $ws9
 bindsym $mod+0 workspace $ws10
 
+# Switch visible workspaces (e.g. multi monitor setup)
+bindsym $mod+Tab exec i3-msg workspace "$( \
+	i3-msg -t get_workspaces | \
+	jq '.[] | select(.visible and (.focused | not)).num' | \
+	head -1)"
+
 # move focused container to workspace
 bindsym $mod+Shift+1 move container to workspace $ws1
 bindsym $mod+Shift+2 move container to workspace $ws2