Class view: Add drag & drop onto editor splits

Change-Id: I35bc03d4e963500a7edf37d6f9d0ddd0a6c68529
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/plugins/classview/classviewparsertreeitem.cpp

@@ -316,6 +316,10 @@ void ParserTreeItem::convertTo(QStandardItem *item) const
             // icon
             add->setIcon(ptr->icon());
 
+            // draggable
+            if (!ptr->symbolLocations().isEmpty())
+                add->setFlags(add->flags() | Qt::ItemIsDragEnabled);
+
             // locations
             add->setData(Utils::locationsToRole(ptr->symbolLocations()),
                          Constants::SymbolLocationsRole);