I'm sorry but I've wasted enough time on this. I believe I'm still leaving more than enough time to give some feedback, either commenting on the code or even rejecting the changes for whatever reason you might find appropriate.
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https://gitlab.winehq.org/wine/wine/-/merge_requests/5667#note_71331
After an earlier rewrite, this flag works with all message types. So this expands its usage to some cases where we were using the `optional` flag for messages that are missing on Wine.
Some of the comments saying Wine is broken for not sending them turned out to be wrong - they're not always sent on Windows either - and in those cases the comments were removed.
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https://gitlab.winehq.org/wine/wine/-/merge_requests/5708