Fix memory leak in REveDataCollection::ClearItems()

Author: alja

graf3d/eve7/inc/ROOT/REveDataCollection.hxx

@@ -132,7 +132,7 @@ public:
 
    void ReserveItems(Int_t items_size) { fItemList->fItems.reserve(items_size); }
    void AddItem(void *data_ptr, const std::string& n, const std::string& t);
-   void ClearItems() { fItemList->fItems.clear(); }
+   void ClearItems();
 
    Bool_t SingleRnrState() const override { return kTRUE; }
    Bool_t SetRnrState(Bool_t) override;

graf3d/eve7/src/REveDataCollection.cxx

@@ -453,3 +453,10 @@ Int_t REveDataCollection::WriteCoreJson(nlohmann::json &j, Int_t rnr_offset)
    return ret;
 }
 
+void REveDataCollection::ClearItems()
+{
+   for (size_t i = 0; i < fItemList->fItems.size(); ++i) {
+      delete fItemList->fItems[i];
+   }
+   fItemList->fItems.clear();
+}