Change default: Don't generate raster thumbnail for legend (Fix #8175)

Author: m-kuhn

src/app/legend/qgslegendlayer.cpp

@@ -314,7 +314,7 @@ QPixmap QgsLegendLayer::getOriginalPixmap()
     else if ( theLayer->type() == QgsMapLayer::RasterLayer )
     {
       QSettings s;
-      if ( s.value( "/qgis/createRasterLegendIcons", true ).toBool() )
+      if ( s.value( "/qgis/createRasterLegendIcons", false ).toBool() )
       {
         QgsRasterLayer* rlayer = qobject_cast<QgsRasterLayer *>( theLayer );
         return rlayer->previewAsPixmap( QSize( 32, 32 ) );

src/app/qgsoptions.cpp

@@ -518,7 +518,7 @@ QgsOptions::QgsOptions( QWidget *parent, Qt::WFlags fl ) :
   cbxAddPostgisDC->setChecked( settings.value( "/qgis/addPostgisDC", false ).toBool() );
   cbxAddOracleDC->setChecked( settings.value( "/qgis/addOracleDC", false ).toBool() );
   cbxAddNewLayersToCurrentGroup->setChecked( settings.value( "/qgis/addNewLayersToCurrentGroup", false ).toBool() );
-  cbxCreateRasterLegendIcons->setChecked( settings.value( "/qgis/createRasterLegendIcons", true ).toBool() );
+  cbxCreateRasterLegendIcons->setChecked( settings.value( "/qgis/createRasterLegendIcons", false ).toBool() );
   cbxCopyWKTGeomFromTable->setChecked( settings.value( "/qgis/copyGeometryAsWKT", true ).toBool() );
   leNullValue->setText( settings.value( "qgis/nullValue", "NULL" ).toString() );
   cbxIgnoreShapeEncoding->setChecked( settings.value( "/qgis/ignoreShapeEncoding", true ).toBool() );
@@ -968,7 +968,7 @@ void QgsOptions::saveOptions()
   settings.setValue( "/qgis/addPostgisDC", cbxAddPostgisDC->isChecked() );
   settings.setValue( "/qgis/addOracleDC", cbxAddOracleDC->isChecked() );
   settings.setValue( "/qgis/addNewLayersToCurrentGroup", cbxAddNewLayersToCurrentGroup->isChecked() );
-  bool createRasterLegendIcons = settings.value( "/qgis/createRasterLegendIcons", true ).toBool();
+  bool createRasterLegendIcons = settings.value( "/qgis/createRasterLegendIcons", false ).toBool();
   settings.setValue( "/qgis/createRasterLegendIcons", cbxCreateRasterLegendIcons->isChecked() );
   settings.setValue( "/qgis/copyGeometryAsWKT", cbxCopyWKTGeomFromTable->isChecked() );
   settings.setValue( "/qgis/new_layers_visible", chkAddedVisibility->isChecked() );