better highlight coefficient management

databrowser-gui/src/main/java/org/cdma/gui/databrowser/model/ChartSpectrumItem.java

@@ -27,8 +27,9 @@ import fr.soleil.lib.project.ObjectUtils;
 
 public class ChartSpectrumItem extends AbstractItem {
 
-    private final Set<IChartSpectrumItemListener> chartSpectrumItemListeners;
+    private static final double HIGHLIGHT_COEFFICIENT = 3;
 
+    private final Set<IChartSpectrumItemListener> chartSpectrumItemListeners;
     private final WeakReference<ChartSpectrumViewer> chartSpectrumViewerRef;
 
     private DataBrowserController controller;
@@ -46,7 +47,6 @@ public class ChartSpectrumItem extends AbstractItem {
         super(item, controller);
 
         this.chartSpectrumViewerRef = chartSpectrumViewer == null ? null : new WeakReference<>(chartSpectrumViewer);
-        ;
         this.controller = controller;
         this.markerEnabled = markerEnabled;
 
@@ -262,7 +262,7 @@ public class ChartSpectrumItem extends AbstractItem {
                         highlightMethod = chartViewer.getDataViewHighlightMethod(readId);
                     }
                     if (selected) {
-                        chartViewer.setDataViewHighlightCoefficient(readId, 1);
+                        chartViewer.setDataViewHighlightCoefficient(readId, HIGHLIGHT_COEFFICIENT);
                         chartViewer.setDataViewHighlightMethod(readId, IChartViewer.HIGHLIGHT_ADD);
                     } else {
                         chartViewer.setDataViewHighlightCoefficient(readId, highlightCoeff);
@@ -287,7 +287,7 @@ public class ChartSpectrumItem extends AbstractItem {
                     highlightMethod = chartViewer.getDataViewHighlightMethod(readDataViewId);
                 }
                 if (selected) {
-                    chartViewer.setDataViewHighlightCoefficient(readDataViewId, 1);
+                    chartViewer.setDataViewHighlightCoefficient(readDataViewId, HIGHLIGHT_COEFFICIENT);
                     chartViewer.setDataViewHighlightMethod(readDataViewId, IChartViewer.HIGHLIGHT_ADD);
                 } else {
                     chartViewer.setDataViewHighlightCoefficient(readDataViewId, highlightCoeff);