Looking at this I'm wondering if this Isn't at least partially handled by the BreakConstructorInitializersStyle in combination with ConstructorInitializerAllOnOneLineOrOnePerLine style?
Oct 1 2019
Sep 30 2019
For what it's worth the original post is also the style used at our company. I am hesitant to patch clang-format as I don't want to have to maintain it so I hope this is added as an option. Or if there was a way we could add this style without having to patch clang format.