10e95bebca
Adding "writeback" callbacks to the depsgraph should be temporary, since these callbacks can bind pointers that become invalid. In this case: the evaluated nodes modifier bound by a bake node callback. These callbacks are cleared after being added in the `deg_flush_updates_and_refresh` function, but there are other cases where depsgraph updates are executed which don't support writeback callbacks (`object_force_modifier_update_for_bind` run by the smooth modifier "bind" function). To prevent dangling invalid pointers in outdated callbacks, disallow adding callbacks in any case other than the `deg_flush_updates_and_refresh` function. Since callbacks can be added from any depsgraph update, the safest way to prevent adding them is in the depsgraph itself. If the `use_writeback_callbacks` flag is not set, any callback is simply discarded. Pull Request: https://projects.blender.org/blender/blender/pulls/137083
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