Remember focused pane on tab change

[odrevet]

I could be nice that zellij remember the selected pane on tab change:

For example:

• Open a pane, we now have two panes: the "Left pane" and the "Right pane", with the "Right one" focused
• Focus to Left pane
• Open a new Tab
• Switch back to the first Tab
• The Right pane is focused instead of the Left pane

[imsnif]

Yes please! I think @raphCode is working on this.