I'm likely to add some of these while working on MSAA events, which aren't related to the MSAA events but are caused by other differences in Wine. I thought it'd be better to be able to properly mark todo's, so that we know when they're fixed.
This revealed some cases where we have an "optional" message for Wine, but Wine has since been fixed.
In a future MR, I plan to also rename winevent_hook_todo and use it more broadly for the opposite case.