Zoom in/out should be applied per Tab/Pane.

[l-const]

I checked both gnome terminal and tilix and that is the default behaviour. Screenshot from tilix:

i also observed a considerate amount of lag as reported from #227

[l-const]

Just checked and cosmic-files zoom is also applied per Tab. Reference: https://github.com/pop-os/cosmic-files/blob/e4c65883fd82af6e4850916e040535259c1e3c82/src/tab.rs#L1829