9c6488ca42
Caused by ba28469e45.
The `total_size()` function excludes the start offset now, which meant
that the `dst_curve_num` and `dst_point_num` were off.
The fix makes sure to include the src curves and points totals in the
destination if `keep_original` is true.
Pull Request: https://projects.blender.org/blender/blender/pulls/128523