$ git grep -A2 get_file_size
We have a comment in core code as follows:
TODO MDL-33297 remove this function completely?
This was not done in MDL-33297. After greping the code it doesn't look like it is being used in core at all. Perhaps it is safe to deprecate it.
MDL-33297 File picker doesn't display some recently uploaded files as a student.
MDL-78706 Final removal of repository get_file_size
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