[ui] Fix layout designer panel icon (re)sizing

Author: nirvn

src/app/layout/qgslayoutdesignerdialog.cpp

@@ -1078,15 +1078,26 @@ void QgsLayoutDesignerDialog::setCurrentLayout( QgsLayout *layout )
 
 void QgsLayoutDesignerDialog::setIconSizes( int size )
 {
+  QSize iconSize = QSize( size, size );
+  QSize panelIconSize = QgsGuiUtils::panelIconSize( iconSize );
+
   //Set the icon size of for all the toolbars created in the future.
-  setIconSize( QSize( size, size ) );
+  setIconSize( iconSize );
 
   //Change all current icon sizes.
   QList<QToolBar *> toolbars = findChildren<QToolBar *>();
   const auto constToolbars = toolbars;
   for ( QToolBar *toolbar : constToolbars )
   {
-    toolbar->setIconSize( QSize( size, size ) );
+    QString className = toolbar->parent()->metaObject()->className();
+    if ( className == QLatin1String( "QgsLayoutDesignerDialog" ) )
+    {
+      toolbar->setIconSize( iconSize );
+    }
+    else
+    {
+      toolbar->setIconSize( panelIconSize );
+    }
   }
 }
 

src/app/layout/qgslayoutmapwidget.cpp

@@ -31,6 +31,8 @@
 #include "qgslayoutundostack.h"
 #include "qgslayoutatlas.h"
 #include "qgslayoutdesignerinterface.h"
+#include "qgsguiutils.h"
+
 #include <QMenu>
 #include <QMessageBox>
 
@@ -86,7 +88,7 @@ QgsLayoutMapWidget::QgsLayoutMapWidget( QgsLayoutItemMap *item )
   setPanelTitle( tr( "Map Properties" ) );
   mMapRotationSpinBox->setClearValue( 0 );
 
-  mDockToolbar->setIconSize( QgisApp::instance()->iconSize( true ) );
+  mDockToolbar->setIconSize( QgsGuiUtils::iconSize( true ) );
 
   //add widget for general composer item properties
   mItemPropertiesWidget = new QgsLayoutItemPropertiesWidget( this, item );