### New features

[`Transform.getMirror`](https://prosemirror.net/docs/ref/#transform.Transform.getMirror), usable in obscure circumstances for inspecting the mirroring structure or a transform, is now a public method.

New utility function [`dropPoint`](https://prosemirror.net/docs/ref/#transform.dropPoint), which tries to find a valid position for dropping a slice near a given document position.