Fix a thumbnail error(about current thumbnail), after reload data.

src/src/view/thumbnailbarwidget.cpp

@@ -110,7 +110,8 @@ void ThumbnailBarWidget::updateThumbnailBar()
 		LabelList.removeOne(l);
 		delete l;
 	}
-
+	clear();
+    bool firstThumbnail = true;
 	DicomLoader *helper = DicomLoader::GetInstance();
 	//获取Patient
 	const PatientsMapType & all_patients = helper->getPatientsList();
@@ -144,7 +145,12 @@ void ThumbnailBarWidget::updateThumbnailBar()
             SeriesMapType *series = it_st->second->series;
             for (SeriesMapType::const_iterator it_se = series->cbegin(); it_se != series->cend(); it_se++) {
                 thumbnailImage *thumbnail = createThumbnailImage(seriesPanel, it_se->second);
+
                 seriesPanel->layout()->addWidget(thumbnail);
+                if (firstThumbnail){
+                    setCurrentImageLabel(thumbnail);
+                    firstThumbnail = false;
+                }
                 //save all thumbnail in one list
                 LabelList << thumbnail;
             }