Avoid use of flatbuffers::size_prefixed_root #7109
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Which issue does this PR close?
Closes #7058
Rationale for this change
flatbuffers::size_prefixed_root does not seem to do what was originally expected. Replacing it with more explicit code for handling an encapsulated message prefix seems to resolve the case of interest.
What changes are included in this PR?
Usage of
size_prefixed_root
( there was only one call, introduced in #2586 ) is replaced with manual prefixed length wrangling. A unit test is addedAre there any user-facing changes?
No
Maybe the error messages?