PartitionModel: Add IsFreeSpaceRole

src/modules/partition/PartitionModel.cpp

@@ -174,6 +174,8 @@ PartitionModel::data( const QModelIndex& index, int role ) const
             return QVariant();
     case SizeRole:
         return ( partition->lastSector() - partition->firstSector() + 1 ) * m_device->logicalSectorSize();
+    case IsFreeSpaceRole:
+        return PMUtils::isPartitionFreeSpace( partition );
     default:
         return QVariant();
     }

src/modules/partition/PartitionModel.h

@@ -50,7 +50,8 @@ public:
     {
         // The raw size, as a qlonglong. This is different from the DisplayRole of
         // SizeColumn, which is a human-readable string.
-        SizeRole = Qt::UserRole + 1
+        SizeRole = Qt::UserRole + 1,
+        IsFreeSpaceRole
     };
 
     enum Column