@@ -144,0 +145,4 @@
+static void join_grease_pencil(const Span<const GeometryComponent *> src_components,
+                               GeometrySet &result)
+{
+  int tot_drawings = 0;

@@ -144,0 +146,4 @@
+                               GeometrySet &result)
+{
+  int tot_drawings = 0;
+  Vector<int> start_offsets;

@@ -144,0 +164,4 @@
+    const bke::GreasePencilComponent &src_grease_pencil_component =
+        static_cast<const bke::GreasePencilComponent &>(*src_components[index]);
+    const int start_offset = start_offsets[index];
+    for (int i = 0; i < src_grease_pencil_component.get()->drawing_array_num; i++) {

@@ -144,0 +180,4 @@
+          const GreasePencilDrawingReference *src_drawing_reference =
+              reinterpret_cast<const GreasePencilDrawingReference *>(src_drawing_base);
+          dst_grease_pencil->drawing_array[start_offset + i] =
+              reinterpret_cast<GreasePencilDrawingBase *>(MEM_dupallocN(src_drawing_reference));

@@ -144,0 +192,4 @@
+    const bke::GreasePencilComponent &src_grease_pencil_component =
+        static_cast<const bke::GreasePencilComponent &>(*src_components[index]);
+    const int start_offset = start_offsets[index];
+    const blender::Span<const bke::greasepencil::Layer *> src_layers =

@@ -144,0 +164,4 @@
+    const bke::GreasePencilComponent &src_grease_pencil_component =
+        static_cast<const bke::GreasePencilComponent &>(*src_components[index]);
+    const int start_offset = start_offsets[index];
+    for (const int i : src_grease_pencil_component.get()->drawings().index_range()) {

@@ -505,0 +512,4 @@
+
+TreeNode &TreeNode::operator=(const TreeNode &other)
+{
+  copy_tree_node(other, *this);

@@ -1494,0 +1623,4 @@
+
+    const Span<const bke::greasepencil::Layer *> layers = grease_pencil->layers();
+    for (const int layer_i : layers.index_range()) {
+      char unique_name[MAX_NAME];