Fixed navigation to 'all files' to grant correct reuse of existing FileDisplayActivity in current task

src/com/owncloud/android/ui/activity/FileActivity.java

@@ -73,7 +73,6 @@ import com.owncloud.android.lib.common.operations.RemoteOperationResult;
 import com.owncloud.android.lib.common.operations.RemoteOperationResult.ResultCode;
 import com.owncloud.android.lib.common.utils.Log_OC;
 import com.owncloud.android.lib.resources.status.OCCapability;
-import com.owncloud.android.operations.CreateShareViaLinkOperation;
 import com.owncloud.android.operations.CreateShareWithShareeOperation;
 import com.owncloud.android.operations.GetSharesForFileOperation;
 import com.owncloud.android.operations.SynchronizeFileOperation;
@@ -87,7 +86,6 @@ import com.owncloud.android.ui.NavigationDrawerItem;
 import com.owncloud.android.ui.adapter.NavigationDrawerListAdapter;
 import com.owncloud.android.ui.dialog.ConfirmationDialogFragment;
 import com.owncloud.android.ui.dialog.LoadingDialog;
-import com.owncloud.android.ui.dialog.SharePasswordDialogFragment;
 import com.owncloud.android.ui.dialog.SslUntrustedCertDialog;
 import com.owncloud.android.utils.ErrorMessageAdapter;
 
@@ -1002,6 +1000,7 @@ public class FileActivity extends AppCompatActivity
     public void restart(){
         Intent i = new Intent(this, FileDisplayActivity.class);
         i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
+        i.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
         startActivity(i);
     }