Fixed bug where histogram disappears when defocussing then focusing histogram tab

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@14387 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: timlinux

src/app/qgsrasterlayerproperties.cpp

@@ -276,6 +276,9 @@ QgsRasterLayerProperties::QgsRasterLayerProperties( QgsMapLayer* lyr, QgsMapCanv
   listWidget->setCurrentRow( settings.value( "/Windows/RasterLayerProperties/row" ).toInt() );
 
   setWindowTitle( tr( "Layer Properties - %1" ).arg( lyr->name() ) );
+  mpHistogramLayout = new QVBoxLayout( mChartWidget );
+  mpHistogramLayout->setContentsMargins( 0, 0, 0, 0 );
+  mChartWidget->setLayout( mpHistogramLayout );
 } // QgsRasterLayerProperties ctor
 
 
@@ -1863,10 +1866,7 @@ void QgsRasterLayerProperties::refreshHistogram()
   mpPlot = new QwtPlot( mChartWidget );
   //ensure all children get removed
   mpPlot->setAutoDelete( true );
-  QVBoxLayout *mpHistogramLayout = new QVBoxLayout( mChartWidget );
-  mpHistogramLayout->setContentsMargins( 0, 0, 0, 0 );
   mpHistogramLayout->addWidget( mpPlot );
-  mChartWidget->setLayout( mpHistogramLayout );
   mpPlot->setTitle( QObject::tr( "Raster Histogram") );
   mpPlot->insertLegend( new QwtLegend(), QwtPlot::BottomLegend );
   // Set axis titles

src/app/qgsrasterlayerproperties.h

@@ -26,7 +26,7 @@
 #include "qgscolorrampshader.h"
 #include "qgscontexthelp.h"
 
-
+class QVBoxLayout;
 class QgsMapLayer;
 class QgsMapCanvas;
 class QgsRasterLayer;
@@ -222,6 +222,7 @@ class QgsRasterLayerProperties : public QDialog, private Ui::QgsRasterLayerPrope
     QgsMapCanvas* mMapCanvas;
     QgsPixelSelectorTool* mPixelSelectorTool;
     QwtPlot * mpPlot;
+    QVBoxLayout *mpHistogramLayout;
 };
 
 /**