Add hack to PCM to create a rescanned device copy to use as preview.

src/modules/partition/core/PartitionCoreModule.cpp

@@ -151,6 +151,17 @@ PartitionCoreModule::partitionModelForDevice( Device* device ) const
     return info->partitionModel.data();
 }
 
+
+Device*
+PartitionCoreModule::createImmutableDeviceCopy( Device* device ) const
+{
+    CoreBackend* backend = CoreBackendManager::self()->backend();
+
+    Device* deviceBefore = backend->scanDevice( device->deviceNode() );
+    return deviceBefore;
+}
+
+
 void
 PartitionCoreModule::createPartitionTable( Device* device, PartitionTable::TableType type )
 {

src/modules/partition/core/PartitionCoreModule.h

@@ -65,6 +65,14 @@ public:
 
     PartitionModel* partitionModelForDevice( Device* device ) const;
 
+    //HACK: all devices change over time, and together make up the state of the CoreModule.
+    //      However this makes it hard to show the *original* state of a device.
+    //      With this horrible hack we rescan a single device node to create a Device object
+    //      that contains the current state of a disk regardless of subsequent changes.
+    //      This should probably be redone some other way.
+    //              -- Teo 4/2015
+    Device* createImmutableDeviceCopy( Device* device ) const;
+
     QAbstractItemModel* bootLoaderModel() const;
 
     void createPartitionTable( Device* device, PartitionTable::TableType type );