GPv3: `reorder` operator

Warning: this currently does not compile.

@@ -261,6 +261,17 @@ PointCloud *reorder_points(const PointCloud &src_pointcloud,
   return dst_pointcloud;
 }
 
+bke::CurvesGeometry reorder_curves_geometry(

@@ -1605,0 +1661,4 @@
+    B.to_indices(indices.as_mutable_span().take_back(B.size()));
+  }
+  else if (direction == ReorderDirection::DOWN) {
+    selected.foreach_index([&](const int curve_i, const int pos) {

@@ -1605,0 +1670,4 @@
+    });
+  }
+  else if (direction == ReorderDirection::UP) {
+    Array<int32_t> selected_indices(selected.size());

@@ -1605,0 +1673,4 @@
+    Array<int32_t> selected_indices(selected.size());
+    selected.to_indices(selected_indices.as_mutable_span());
+
+    /* Because each index is moving up we need to loop thru the indices backwards,

@@ -1605,0 +1696,4 @@
+  Object *object = CTX_data_active_object(C);
+  GreasePencil &grease_pencil = *static_cast<GreasePencil *>(object->data);
+
+  const ReorderDirection direction = ReorderDirection(RNA_enum_get(op->ptr, "direction"));

@@ -1605,0 +1731,4 @@
+
+static void GREASE_PENCIL_OT_stroke_reorder(wmOperatorType *ot)
+{
+  static const EnumPropertyItem prop_reorder_direction[] = {

@@ -1540,0 +1693,4 @@
+
+/** \} */
+
+static void grease_pencil_operatormarcos_define()