* initialize pasted feature with default values (fixes #8800)

* show default values of new features in attribute table and identify
  results

Author: jef-n

src/app/qgisapp.cpp

@@ -7379,16 +7379,26 @@ void QgisApp::editPaste( QgsMapLayer *destinationLayer )
     QgsAttributes srcAttr = featureIt->attributes();
     QgsAttributes dstAttr( dstAttrCount );
 
+    // pre-initialized with default values
+    for ( int dst = 0; dst < dstAttr.count(); ++dst )
+    {
+      QVariant defVal( pasteVectorLayer->dataProvider()->defaultValue( dst ) );
+      if( !defVal.isNull() )
+      {
+        dstAttr[ dst ] = defVal;
+      }
+    }
+
     for ( int src = 0; src < srcAttr.count(); ++src )
     {
       int dst = remap.value( src, -1 );
       if ( dst < 0 )
         continue;
 
-      // use default value for primary key fields if it's NOT NULL
+      // don't overwrite default value for primary key fields if it's NOT NULL
+      // or for spatialite layers
       if ( pkAttrList.contains( dst ) )
       {
-        dstAttr[ dst ] = pasteVectorLayer->dataProvider()->defaultValue( dst );
         if ( !dstAttr.at( dst ).isNull() )
           continue;
         else if ( pasteVectorLayer->providerType() == "spatialite" )

src/app/qgsidentifyresultsdialog.cpp

@@ -34,6 +34,7 @@
 #include "qgsproject.h"
 #include "qgsrasterlayer.h"
 #include "qgsvectorlayer.h"
+#include "qgsvectordataprovider.h"
 #include "qgswebview.h"
 #include "qgswebframe.h"
 
@@ -470,7 +471,11 @@ void QgsIdentifyResultsDialog::addFeature( QgsVectorLayer *vlayer, const QgsFeat
     if ( i >= fields.count() )
       continue;
 
-    QString value = fields.at( i ).displayString( attrs.at( i ) );
+    QString defVal;
+    if ( fields.fieldOrigin( i ) == QgsFields::OriginProvider && vlayer->dataProvider() )
+      defVal = vlayer->dataProvider()->defaultValue( fields.fieldOriginIndex( i ) ).toString();
+
+    QString value = defVal == attrs.at( i ) ? defVal : fields.at( i ).displayString( attrs.at( i ) );
     QTreeWidgetItem *attrItem = new QTreeWidgetItem( QStringList() << QString::number( i ) << value );
 
     attrItem->setData( 0, Qt::DisplayRole, vlayer->attributeDisplayName( i ) );

src/gui/editorwidgets/core/qgseditorwidgetfactory.cpp

@@ -17,6 +17,7 @@
 #include "qgsdefaultsearchwidgetwrapper.h"
 #include "qgssearchwidgetwrapper.h"
 #include "qgsfield.h"
+#include "qgsvectordataprovider.h"
 
 #include <QSettings>
 
@@ -67,7 +68,11 @@ QString QgsEditorWidgetFactory::representValue( QgsVectorLayer* vl, int fieldIdx
   Q_UNUSED( cache )
   Q_UNUSED( value )
 
-  return vl->fields().at( fieldIdx ).displayString( value );
+  QString defVal;
+  if ( vl->fields().fieldOrigin( fieldIdx ) == QgsFields::OriginProvider && vl->dataProvider() )
+    defVal = vl->dataProvider()->defaultValue( vl->fields().fieldOriginIndex( fieldIdx ) ).toString();
+
+  return value == defVal ? defVal : vl->fields().at( fieldIdx ).displayString( value );
 }
 
 Qt::AlignmentFlag QgsEditorWidgetFactory::alignmentFlag( QgsVectorLayer* vl, int fieldIdx, const QgsEditorWidgetConfig& config ) const