Duty on background

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

@@ -3559,7 +3559,7 @@ class Core {
                             } finally {
                                 // Free memory
                                 isub[j] = null;
-                                dc.stop();
+                                dc.stop(state.getForeground());
                             }
                         }
                     }
@@ -3647,7 +3647,7 @@ class Core {
                         } finally {
                             // Free memory
                             isub[j] = null;
-                            dc.stop();
+                            dc.stop(state.getForeground());
                         }
                     }
                 }
@@ -5625,6 +5625,7 @@ class Core {
         private Thread thread = new Thread();
         private Semaphore semaphore = new Semaphore(0);
         private boolean running = true;
+        private boolean foreground = false;
         private boolean recoverable = true;
         private Throwable unrecoverable = null;
         private Long lastActivity = null;
@@ -5809,6 +5810,14 @@ class Core {
             return serial;
         }
 
+        void setForeground(boolean value) {
+            this.foreground = value;
+        }
+
+        boolean getForeground() {
+            return this.foreground;
+        }
+
         @NonNull
         @Override
         public String toString() {

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

@@ -48,7 +48,7 @@ public class DutyCycle {
         start = new Date().getTime();
     }
 
-    public void stop() {
+    public void stop(boolean foreground) {
         long end = new Date().getTime();
 
         if (last != null)
@@ -59,8 +59,9 @@ public class DutyCycle {
 
         if (busy + idle > interval) {
             long wait = (duration - idle);
-            Log.i(name + " busy=" + busy + " idle=" + idle + " wait=" + wait);
+            Log.i(name + " busy=" + busy + " idle=" + idle +
-            if (wait > 0) {
+                    " wait=" + wait + " foreground=" + foreground);
+            if (wait > 0 && foreground) {
                 try {
                     Thread.sleep(wait);
                 } catch (InterruptedException ex) {

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

@@ -1193,6 +1193,8 @@ public class ServiceSynchronize extends ServiceBase implements SharedPreferences
 
     private void onState(Intent intent) {
         foreground = intent.getBooleanExtra("foreground", false);
+        for (Core.State state : coreStates.values())
+            state.setForeground(foreground);
     }
 
     private void onPoll(Intent intent) {
@@ -1992,7 +1994,7 @@ public class ServiceSynchronize extends ServiceBase implements SharedPreferences
                                                                         iservice, ifolder,
                                                                         state, serial);
                                                             } finally {
-                                                                dc.stop();
+                                                                dc.stop(state.getForeground());
                                                             }
 
                                                         } catch (Throwable ex) {