* Group of backends can now contain keyword `:separate`, which makes candidates
from different backends sorted separately in the combined list.
* New frontend `company-pseudo-tooltip-unless-just-one-frontend-with-delay`.
+* New transformer `company-sort-prefer-same-case-prefix`.
* The value of `company-dabbrev-ignore-buffers` can also be a function.
* `company-files` has been moved to right after `company-capf` in
`company-backends`