How to add a monitor to show a fixed workspace, and while switching to this workspace, both outputs show it?
For example, I want to use VGA1 to always show workspace 9, but when I switch to workspace 9, I can view it from both LVDS1 and VGA1.
I have read articles in i3 User Guide about multi-monitor. It seems that there are only tips about both outputs displaying the same thing (give a presentation) and different outputs displaying totally different things (extend mode? In this mode, a workspace can't be viewed in both outputs at the same time).