f5602becde
The function for retrieving a shape key by its index is named somewhat confusingly, and effectively reimplements BLI_findlink. However, more importantly, for some reason it is coded to return null for the index 0 instead of the basis shape key. This severely limits its usability in some cases. This refactor replaces the function with a simple strongly typed wrapper around BLI_findlink, using a different name, and updating the call sites to check that the index is not 0 where necessary.
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