Re-enable loading of icons with fling

Reduce their thread priority to try to avoid it from lagging the scrolling

src/org/fdroid/fdroid/FDroidApp.java

@@ -51,6 +51,7 @@ import org.thoughtcrime.ssl.pinning.SystemKeyStore;
 
 import javax.net.ssl.*;
 import java.io.File;
+import java.lang.Thread;
 import java.security.KeyManagementException;
 import java.security.KeyStore;
 import java.security.KeyStoreException;
@@ -154,6 +155,7 @@ public class FDroidApp extends Application {
                         2592000)
                     )
             .threadPoolSize(Runtime.getRuntime().availableProcessors() * 2)
+            .threadPriority(Thread.NORM_PRIORITY - 2) // Default is NORM_PRIORITY - 1
             .build();
         ImageLoader.getInstance().init(config);
 

src/org/fdroid/fdroid/views/fragments/AppListFragment.java

@@ -63,7 +63,6 @@ abstract public class AppListFragment extends ListFragment implements
         // onActivityCreated" according to the docs.
         getListView().setFastScrollEnabled(true);
         getListView().setOnItemClickListener(this);
-        getListView().setOnScrollListener(new PauseOnScrollListener(ImageLoader.getInstance(), false, true));
     }
 
     @Override