In RNA collections storing ID references, the name of the collection
item may not always be unique, when several IDs from different libraries
are present.
While rare, this situation can become deadly to liboverride, by causing
random but exponential liboverride hierarchies corruptions.
This has already been alleviated by using preferably both name and index
in items lookup (a05419f18b) and by reducing the risk of name collision
in general between liboverrides and their linked reference (b9becc47de).
This commit goes further, by ensuring that references to items of RNA
collections of IDs stored in liboverride operations become completely
unambiguous. This is achieved by storing an extra pointer to the item's
ID itself, when relevant.
Lookup then requires a complete match `name + ID` to be successful,
which is guaranteed to match at most a single item in the whole RNA
collection (since RNA collection of IDs do not allow duplicates, and
the ID pointer is always unique).
Note that this ID pointer is implemented as an `std::optional` one
(either directly in C++ code, or using an new liboverride operation `flag`
in DNA). This allows to smoothly transition from existing data to the
added ID pointer info (when needed), without needing any dedicated
versioning. This solution also preserves forward compatibility as much
as possible.
It may also provide marginal performances improvements in some cases, as
looking up for ID items in RNA collections will first check for the
ID pointer, which should be faster than a string comparision.
Implements #110421.
Pull Request: https://projects.blender.org/blender/blender/pulls/110773
A lot of files were missing copyright field in the header and
the Blender Foundation contributed to them in a sense of bug
fixing and general maintenance.
This change makes it explicit that those files are at least
partially copyrighted by the Blender Foundation.
Note that this does not make it so the Blender Foundation is
the only holder of the copyright in those files, and developers
who do not have a signed contract with the foundation still
hold the copyright as well.
Another aspect of this change is using SPDX format for the
header. We already used it for the license specification,
and now we state it for the copyright as well, following the
FAQ:
https://reuse.software/faq/
