UGeometryScriptLibrary_EditorDynamicMeshFunctions::BeginTrackedMeshChange

Save current state of TargetMesh so that an undoable/redoable Change can be emitted after TargetMesh is modified, using [EmitTrackedMeshChange()](API\Plugins\GeometryScriptingEditor\GeometryScript\UGeometryScriptL-_1\EmitTrackedMeshC-).