Cancel processing

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

@@ -530,6 +530,8 @@ class Core {
 
             if (ops.size() == 0)
                 state.batchCompleted(folder.id, priority, sequence);
+            else
+                state.error(new OperationCanceledException("Processing"));
         } finally {
             Log.i(folder.name + " end process state=" + state + " pending=" + ops.size());
         }

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

@@ -35,6 +35,7 @@ import android.net.NetworkInfo;
 import android.net.NetworkRequest;
 import android.os.Build;
 import android.os.Bundle;
+import android.os.OperationCanceledException;
 import android.os.PowerManager;
 import android.service.notification.StatusBarNotification;
 import android.text.TextUtils;
@@ -1355,7 +1356,7 @@ public class ServiceSynchronize extends ServiceBase implements SharedPreferences
                                                                         ServiceSynchronize.this,
                                                                         folder.name + " " + Log.formatThrowable(ex, false));
                                                                 db.folder().setFolderError(folder.id, Log.formatThrowable(ex));
-                                                                state.error(ex);
+                                                                state.error(new OperationCanceledException("Process"));
                                                             } finally {
                                                                 if (shouldClose) {
                                                                     if (ifolder != null && ifolder.isOpen()) {