02687d7609
Changes to the drawings array require an update of the `drawing_index` stored in frames. Subsequently the frame storage data (for writing to files) also needs to be updated. This was missing in the `remove_drawings_with_no_users` function, which can lead to invalid `drawing_index` after loading the file again. A regression test has been added for this case. Also fixed a minor memory leak when all the drawings are removed. The drawing array ends up empty but still has a pointer allocated. Fixes should avoid this (nullptr when `drawing_array_num` is zero) but also make sure the array pointer is handled anyway instead of assuming nullptr. Pull Request: https://projects.blender.org/blender/blender/pulls/118569
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