Nop, because the idea behind this patch. The goal is to have an specific markup to control the list of messages/bubbles, the input *and* the recipients container! Currently is not part of this patch, but it's part of the roadmap of the visual refresh.

Recipients container should not be part of the header,because actually it should share the space with the composer. Remember the technical debt we have in the recipients panel (swipe effects, how it interacts with the input and the list of messages...). This is the first step to try to sort this out.