f188d6709f
So far when an anim data had to be created in liboverride (because none existed in reference ID), and reference ID got an anim data added later, that reference anim data would simply replace the one from the liboverride, completely losing all animation-related work done so far in the liboverride. This commit fixes that, by adding some custom handling of anim data when there is a liboverride operation defined on the `animation_data` RNA property itself. It then behaves as if everything that is overridable in the existing liboverride was defined as overrides (and therefore kept), while everything else is replaced by the reference animdata: * Action and temp action are kept. * Settings (extend mode, etc.) are kept. * Active NLA track and strip are kept, and tracks and strips from the liboverride are added at the end of the list of these from the reference data. Note that this behavior is only expected to happen once, on the first call to 'apply overrides' after anim data has been added to the reference linked ID. After that, since both IDs have animdata, there should be no liboverride property defined for the `animation_data` property itself, but only for paths leading inside that animdata struct. Implements #110067.
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