Optimization

app/src/main/java/eu/faircode/email/ConnectionHelper.java

@@ -530,11 +530,18 @@ public class ConnectionHelper {
             return false;
 
         try {
+            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
                 for (Network network : cm.getAllNetworks()) {
                     NetworkCapabilities caps = cm.getNetworkCapabilities(network);
                     if (caps != null && caps.hasTransport(NetworkCapabilities.TRANSPORT_VPN))
                         return true;
                 }
+            } else {
+                Network active = cm.getActiveNetwork();
+                NetworkCapabilities caps = (active == null ? null : cm.getNetworkCapabilities(active));
+                if (caps != null && caps.hasTransport(NetworkCapabilities.TRANSPORT_VPN))
+                    return true;
+            }
         } catch (Throwable ex) {
             Log.w(ex);
         }