ios, android: disable save and test buttons if all servers are disabled (#1457)

apps/ios/Shared/Views/UserSettings/SMPServersView.swift

@@ -63,7 +63,7 @@ struct SMPServersView: View {
                 Button("Reset") { servers = m.userSMPServers ?? [] }
                     .disabled(servers == m.userSMPServers || testing)
                 Button("Test servers", action: testServers)
-                    .disabled(testing)
+                    .disabled(testing || allServersDisabled)
                 Button("Save servers", action: saveSMPServers)
                     .disabled(saveDisabled)
                 howToButton()
@@ -101,12 +101,20 @@ struct SMPServersView: View {
     }
 
     private var saveDisabled: Bool {
-        servers.count == 0 || servers == m.userSMPServers || testing || !servers.allSatisfy { srv in
+        servers.isEmpty ||
+        servers == m.userSMPServers ||
+        testing ||
+        !servers.allSatisfy { srv in
             if let address = parseServerAddress(srv.server) {
                 return uniqueAddress(srv, address)
             }
             return false
-        }
+        } ||
+        allServersDisabled
+    }
+
+    private var allServersDisabled: Bool {
+        servers.allSatisfy { !$0.enabled }
     }
 
     private func smpServerView(_ server: Binding<ServerCfg>) -> some View {