fix: merge namespaces when collecting results

Author: Nerixyz

src/lib/Lib/ExecutionContext.cpp

@@ -14,6 +14,7 @@
 #include "ExecutionContext.hpp"
 #include "lib/Metadata/Reduce.hpp"
 #include <mrdocs/Metadata.hpp>
+#include <mrdocs/Metadata/Info/Namespace.hpp>
 #include <ranges>
 
 namespace clang {
@@ -69,7 +70,16 @@ report(
     {
         auto it = info_.find(other->id);
         MRDOCS_ASSERT(it != info_.end());
-        merge(**it, std::move(*other));
+        if (auto ns = dynamic_cast<NamespaceInfo*>(it->get()))
+        {
+            auto otherNs = dynamic_cast<NamespaceInfo*>(other.get());
+            MRDOCS_ASSERT(otherNs);
+            merge(*ns, std::move(*otherNs));
+        }
+        else
+        {
+            merge(**it, std::move(*other));
+        }
     }
 
     // Merge diagnostics and report any new messages.