This patch for dwm adds a function named goback which allows activating the previously active tagset and binds it to MODKEY+g. Unlike dwm's view function (bound to MODKEY+Tab by default), goback registers when you focus another monitor.
- You are on your first monitor and switch from tag 1 to tag 2. Then
goback(MODKEY+g) brings you back to tag 1 (like MODKEY+Tab). - Next, you focus your third monitor (which is showing tags 3 and 4), no matter if your use your mouse or a shortcut like MODKEY+comma. Then
goback(MODKEY+g) brings the focus back to your first monitor (tag 1). Pressing MODKEY+g again brings you back to the third monitor (tags 3 and 4).