Incorrect cursor position after pasting HTML-formatted code from a webpage

When pasting formatted text from [the Kubernetes Docs](https://kubernetes.io/docs/concepts/services-networking/ingress/#tls), the cursor gets backed up one character from the end.
##### Steps to Reproduce

1. Go to [the Kubernetes Docs](https://kubernetes.io/docs/concepts/services-networking/ingress/#tls)
2. Copy the formatted yaml from the first example
3. Paste into trix editor
4. Observe the new cursor position

##### Details

* Trix version: 0.11.2
* Browser name and version: Google Chrome | 65.0.3325.181 (Official Build) (64-bit)
* Operating system: Linux