Fix tiny symbol layer list on hidpi

Author: nyalldawson

src/gui/symbology/qgssymbolselectordialog.cpp

@@ -232,6 +232,9 @@ QgsSymbolSelectorWidget::QgsSymbolSelectorWidget( QgsSymbol *symbol, QgsStyle *s
   setupUi( this );
   this->layout()->setContentsMargins( 0, 0, 0, 0 );
 
+  layersTree->setMaximumHeight( static_cast< int >( Qgis::UI_SCALE_FACTOR * fontMetrics().height() * 7 ) );
+  layersTree->setMinimumHeight( layersTree->maximumHeight() );
+
   // setup icons
   btnAddLayer->setIcon( QIcon( QgsApplication::iconPath( "symbologyAdd.svg" ) ) );
   btnRemoveLayer->setIcon( QIcon( QgsApplication::iconPath( "symbologyRemove.svg" ) ) );