Use case or problem
I instinctively tried to close pane by middle clicking the tab icon as I do with browser tabs. To close the pane currently, I’d need to right-click it and choose “close”, which is not as frictionless as a middle click.
Middle clicking the icon in side panes should close the pane.
Current workaround (optional)
Related feature requests (optional)
I think Mouse Hotkeys feature request is somewhat related.