[release/dev18.3] Ensure GetFirstRelatedDocumentId doesn't return non-source documents#81923
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jasonmalinowski merged 1 commit intorelease/dev18.3from Jan 9, 2026
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The expectation of our "related" document helpers seems to be they only operate on regular documents. If we didn't do this, and we have a regular source file also being added as an additional file somewhere, callers of this method get surprised. Fixes https://developercommunity.visualstudio.com/t/Constant-Feature-X-is-currently-unava/11023066
JoeRobich
approved these changes
Jan 8, 2026
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Backport of #81893 to release/dev18.3
/cc @jasonmalinowski
Customer Impact
If the user adds a .cs file to one of their projects as additional files, we may break when we try to unify syntax trees for them, since the additional files don't actually have syntax trees.
Regression
Unclear; this might have been an older regression when we introduced this mechanism. The customer who reported it said itw as a regression but since they had made a lot of changes to their code around that time that would have exposed it.
Testing
Unit tests were added. They were validated to produce the same exception as is being reported from the customer.
Risk
Low.