UI: When deactivating for activating another tunnel, disable on-demand

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

Sources/WireGuardApp/Tunnel/TunnelsManager.swift

@@ -419,8 +419,18 @@ class TunnelsManager {
             tunnel.status = .waiting
             activateWaitingTunnelOnDeactivation(of: tunnelInOperation)
             if tunnelInOperation.status != .deactivating {
+                if tunnelInOperation.isActivateOnDemandEnabled {
+                    setOnDemandEnabled(false, on: tunnelInOperation) { [weak self] error in
+                        guard error == nil else {
+                            wg_log(.error, message: "Unable to activate tunnel '\(tunnel.name)' because on-demand could not be disabled on active tunnel '\(tunnel.name)'")
+                            return
+                        }
+                        self?.startDeactivation(of: tunnelInOperation)
+                    }
+                } else {
                     startDeactivation(of: tunnelInOperation)
                 }
+            }
             return
         }