From e63da8809091937d9acb867ab2883c016d6c40fe Mon Sep 17 00:00:00 2001
From: Matthias Kuhn <matthias@opengis.ch>
Date: Thu, 26 Oct 2017 16:30:44 +0200
Subject: [PATCH] NULL value is gray and italic

---
 src/core/qgsfeaturefiltermodel.cpp | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/core/qgsfeaturefiltermodel.cpp b/src/core/qgsfeaturefiltermodel.cpp
index a466d2d14598..30e0b18a3339 100644
--- a/src/core/qgsfeaturefiltermodel.cpp
+++ b/src/core/qgsfeaturefiltermodel.cpp
@@ -136,6 +136,22 @@ QVariant QgsFeatureFilterModel::data( const QModelIndex &index, int role ) const
 
     case IdentifierValueRole:
       return mEntries.value( index.row() ).identifierValue;
+
+    case Qt::ForegroundRole:
+      if ( mEntries.value( index.row() ).identifierValue.isNull() )
+      {
+        return QBrush( QColor( Qt::gray ) );
+      }
+      break;
+
+    case Qt::FontRole:
+      if ( mEntries.value( index.row() ).identifierValue.isNull() )
+      {
+        QFont font = QFont();
+        font.setItalic( true );
+        return font;
+      }
+      break;
   }
 
   return QVariant();