Detection preview panel tweak.

Make sure the detection preview panel is slanted at the bottom of its display.

src/main/java/fiji/plugin/trackmate/util/DetectionPreviewPanel.java

@@ -32,6 +32,7 @@
 import java.util.function.DoubleConsumer;
 
 import javax.swing.JButton;
+import javax.swing.JLabel;
 import javax.swing.JPanel;
 
 import fiji.plugin.trackmate.Logger;
@@ -67,18 +68,20 @@ public DetectionPreviewPanel( final DoubleConsumer thresholdUpdater, final Strin
 	{
 		final GridBagLayout gridBagLayout = new GridBagLayout();
 		gridBagLayout.columnWeights = new double[] { 1.0, 0.0 };
-		gridBagLayout.rowWeights = new double[] { 0., 0. };
-		gridBagLayout.rowHeights = new int[] { 120, 20 };
+		gridBagLayout.rowWeights = new double[] { 1., 0., 0. };
+		gridBagLayout.rowHeights = new int[] { 0, 120, 20 };
 
 		setLayout( gridBagLayout );
 
+		add( new JLabel() );
+
 		this.chart = new QualityHistogramChart( thresholdUpdater, axisLabel );
 		final GridBagConstraints gbcHistogram = new GridBagConstraints();
 		gbcHistogram.gridwidth = 2;
 		gbcHistogram.insets = new Insets( 0, 0, 5, 0 );
 		gbcHistogram.fill = GridBagConstraints.BOTH;
 		gbcHistogram.gridx = 0;
-		gbcHistogram.gridy = 0;
+		gbcHistogram.gridy = 1;
 		add( chart, gbcHistogram );
 
 		final JLabelLogger labelLogger = new JLabelLogger();
@@ -87,7 +90,7 @@ public DetectionPreviewPanel( final DoubleConsumer thresholdUpdater, final Strin
 		gbcLabelLogger.insets = new Insets( 5, 5, 0, 5 );
 		gbcLabelLogger.fill = GridBagConstraints.BOTH;
 		gbcLabelLogger.gridx = 0;
-		gbcLabelLogger.gridy = 1;
+		gbcLabelLogger.gridy = 2;
 		add( labelLogger, gbcLabelLogger );
 		this.logger = labelLogger.getLogger();
 
@@ -107,7 +110,7 @@ public DetectionPreviewPanel( final DoubleConsumer thresholdUpdater, final Strin
 		gbcBtnPreview.anchor = GridBagConstraints.NORTHEAST;
 		gbcBtnPreview.insets = new Insets( 5, 5, 0, 0 );
 		gbcBtnPreview.gridx = 1;
-		gbcBtnPreview.gridy = 1;
+		gbcBtnPreview.gridy = 2;
 		this.add( btnPanel, gbcBtnPreview );
 
 		setPreferredSize( new Dimension( 240, 100 ) );