add source categories to disable unvailable ones for pasting style

src/app/qgsapplayertreeviewmenuprovider.cpp

@@ -39,6 +39,8 @@
 #include "qgssymbolselectordialog.h"
 #include "qgssinglesymbolrenderer.h"
 #include "qgsmaplayerstylecategoriesmodel.h"
+#include "qgsxmlutils.h"
+
 
 
 QgsAppLayerTreeViewMenuProvider::QgsAppLayerTreeViewMenuProvider( QgsLayerTreeView *view, QgsMapCanvas *canvas )
@@ -349,24 +351,38 @@ QMenu *QgsAppLayerTreeViewMenuProvider::createContextMenu()
         {
           if ( layer->type() == QgsMapLayer::VectorLayer )
           {
-            QMenu *pasteStyleMenu = menuStyleManager->addMenu( tr( "Paste Style" ) );
-            pasteStyleMenu->setToolTipsVisible( true );
-
-            QgsMapLayerStyleCategoriesModel *model = new QgsMapLayerStyleCategoriesModel( pasteStyleMenu );
-            model->setShowAllCategories( true );
-            for ( int row = 0; row < model->rowCount(); ++row )
+            QDomDocument doc( QStringLiteral( "qgis" ) );
+            QString errorMsg;
+            int errorLine, errorColumn;
+            if ( doc.setContent( app->clipboard()->data( QGSCLIPBOARD_STYLE_MIME ), false, &errorMsg, &errorLine, &errorColumn ) )
             {
-              QModelIndex index = model->index( row, 0 );
-              QgsMapLayer::StyleCategory category = model->data( index, Qt::UserRole ).value<QgsMapLayer::StyleCategory>();
-              QString name = model->data( index, Qt::DisplayRole ).toString();
-              QString tooltip = model->data( index, Qt::ToolTipRole ).toString();
-              QIcon icon = model->data( index, Qt::DecorationRole ).value<QIcon>();
-              QAction *copyAction = new QAction( icon, name, pasteStyleMenu );
-              copyAction->setToolTip( tooltip );
-              connect( copyAction, &QAction::triggered, this, [ = ]() {app->pasteStyle( layer, category );} );
-              pasteStyleMenu->addAction( copyAction );
-              if ( category == QgsMapLayer::AllStyleCategories )
-                pasteStyleMenu->addSeparator();
+              QDomElement myRoot = doc.firstChildElement( QStringLiteral( "qgis" ) );
+              if ( !myRoot.isNull() )
+              {
+                QMenu *pasteStyleMenu = menuStyleManager->addMenu( tr( "Paste Style" ) );
+                pasteStyleMenu->setToolTipsVisible( true );
+
+                QgsMapLayer::StyleCategories sourceCategories = QgsXmlUtils::readFlagAttribute( myRoot, QStringLiteral( "styleCategories" ), QgsMapLayer::AllStyleCategories );
+
+                QgsMapLayerStyleCategoriesModel *model = new QgsMapLayerStyleCategoriesModel( pasteStyleMenu );
+                model->setShowAllCategories( true );
+                for ( int row = 0; row < model->rowCount(); ++row )
+                {
+                  QModelIndex index = model->index( row, 0 );
+                  QgsMapLayer::StyleCategory category = model->data( index, Qt::UserRole ).value<QgsMapLayer::StyleCategory>();
+                  QString name = model->data( index, Qt::DisplayRole ).toString();
+                  QString tooltip = model->data( index, Qt::ToolTipRole ).toString();
+                  QIcon icon = model->data( index, Qt::DecorationRole ).value<QIcon>();
+                  QAction *pasteAction = new QAction( icon, name, pasteStyleMenu );
+                  pasteAction->setToolTip( tooltip );
+                  connect( pasteAction, &QAction::triggered, this, [ = ]() {app->pasteStyle( layer, category );} );
+                  pasteStyleMenu->addAction( pasteAction );
+                  if ( category == QgsMapLayer::AllStyleCategories )
+                    pasteStyleMenu->addSeparator();
+                  else
+                    pasteAction->setEnabled( sourceCategories.testFlag( category ) );
+                }
+              }
             }
           }
           else