eac1ade956
Commit 0df5d8220b made a change to have the `USDStageReader` only keep
a reference to the ImportSettings struct. This isn't safe to do because
there's scenarios where the ImportSettings might be defined as a stack
variable but the reader outlives the lifetime of that variable. This
happens inside `USD_create_handle` where the reader is returned to the
caller for instance.
Fix this, and the original issue which lead to the change causing the
regression, by having `USDStageReader` own ImportSettings directly so
it's more obvious that it is A) tied to the lifetime of the reader and
B) can no longer become out of sync with a caller's own ImportSettings
data (since that no longer exists).
Pull Request: https://projects.blender.org/blender/blender/pulls/132095
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