Fix memory leak [skip ci]

src/meshgenerator.cpp

@@ -431,8 +431,7 @@ MeshCombiner::Mesh *MeshGenerator::combinePartMesh(const QString &partIdString,
     partCache.previewVertices.clear();
     partCache.isSuccessful = false;
     partCache.joined = (target == PartTarget::Model && !isDisabled);
-    delete partCache.mesh;
-    partCache.mesh = nullptr;
+    partCache.releaseMeshes();
     
     struct NodeInfo
     {
@@ -1471,6 +1470,7 @@ void MeshGenerator::generate()
                     }
                     m_cacheContext->partMirrorIdMap.erase(mirrorFrom);
                 }
+                it->second.releaseMeshes();
                 it = m_cacheContext->parts.erase(it);
                 continue;
             }
@@ -1487,6 +1487,7 @@ void MeshGenerator::generate()
                     }
                     combinationIt++;
                 }
+                it->second.releaseMeshes();
                 it = m_cacheContext->components.erase(it);
                 continue;
             }

src/meshgenerator.h

@@ -20,8 +20,13 @@ class GeneratedPart
 public:
     ~GeneratedPart()
     {
-        delete mesh;
+        releaseMeshes();
     };
+    void releaseMeshes()
+    {
+        delete mesh;
+        mesh = nullptr;
+    }
     MeshCombiner::Mesh *mesh = nullptr;
     std::vector<QVector3D> vertices;
     std::vector<std::vector<size_t>> faces;
@@ -63,6 +68,15 @@ public:
 class GeneratedCacheContext
 {
 public:
+    ~GeneratedCacheContext()
+    {
+        for (auto &it: cachedCombination)
+            delete it.second;
+        for (auto &it: parts)
+            it.second.releaseMeshes();
+        for (auto &it: components)
+            it.second.releaseMeshes();
+    }
     std::map<QString, GeneratedComponent> components;
     std::map<QString, GeneratedPart> parts;
     std::map<QString, QString> partMirrorIdMap;