macOS: Select the active tunnel when showing the manage tunnels window

Signed-off-by: Roopesh Chander <roop@roopc.net>

WireGuard/WireGuard/Tunnel/TunnelsManager.swift

@@ -226,6 +226,10 @@ class TunnelsManager {
         return tunnels[index]
     }
 
+    func index(of tunnel: TunnelContainer) -> Int? {
+        return tunnels.firstIndex(of: tunnel)
+    }
+
     func tunnel(named tunnelName: String) -> TunnelContainer? {
         return tunnels.first { $0.name == tunnelName }
     }

WireGuard/WireGuard/UI/macOS/ViewController/TunnelsListTableViewController.swift

@@ -61,7 +61,8 @@ class TunnelsListTableViewController: NSViewController {
     override func loadView() {
         tableView.dataSource = self
         tableView.delegate = self
-        let isSelected = selectTunnel(at: 0)
+
+        let isSelected = selectTunnelInOperation() || selectTunnel(at: 0)
         if !isSelected {
             delegate?.tunnelsListEmpty()
         }
@@ -110,6 +111,18 @@ class TunnelsListTableViewController: NSViewController {
         view = containerView
     }
 
+    override func viewWillAppear() {
+        selectTunnelInOperation()
+    }
+
+    @discardableResult
+    func selectTunnelInOperation() -> Bool {
+        if let currentTunnel = tunnelsManager.tunnelInOperation(), let indexToSelect = tunnelsManager.index(of: currentTunnel) {
+            return selectTunnel(at: indexToSelect)
+        }
+        return false
+    }
+
     @objc func buttonBarClicked(sender: AnyObject?) {
         guard let buttonBar = sender as? NSSegmentedControl else { return }
         // We have to resort to explicitly showing the menu instead of using NSSegmentedControl.setMenu()