How to make text appear smoothly

I know this is not an issue, but maybe this could be a great feature for Chatto.
I'd need to make the text appear smoothly when I update it

For example, there is two bubble :

```
User1 : "Hey Mate !"

"Hey Bro" : User2
```

And I want to change the text from user2 to :

```
User1 : "Hey Mate !"

"Hey Bro how are you ?" : User2
```

I'd like to make the ' how are you ?' part of the text appear smoothly with an alpha transition .

For example I'd want something like this : https://www.youtube.com/watch?v=9qnm_JPBtPA&feature=youtu.be&t=35s

_Note : I already know how to modify the text, I just don't know how to make a part of the sentence (or the whole sentence) appear smoothly ..._

What would be the solution ?

Thanks !

The issue names no files, tests, or entry points. Start by locating Chatto's text-bubble update path and reviewing how text changes are currently handled, then compare it with the linked animation example. Done would require an agreed implementation scope and a verified smooth alpha transition for the changed text.

Written by the indexing model from the issue text.