Treat multibuffer edit events properly

Miltibuffer emits edit events even if it only got an excerpt
added/removed/etc.
Separate buffer edits and trigger hint invalidation refresh for them
only, also trigger hint new lines refresh on excerpt addition events.
48659d3b3cKirill Bulatov committed on 8/26/2023, 11:13:24 AMparent3fc48fc
2 files changedLine totals unavailable