Support syntax highlighting for two languages in a small number of cases

Spec
1

Hello. I’ve encountered that it can be very useful to enable simultaneous syntax highlighting for some exceptional cases. However, we are not talking about complex scenarios like nested language constructs, but about showing diff and patch changes alongside with the default language. This is a fairly universal highlight that colors the entire background of some lines. Is it possible to allow the combination of languages ​​in code blocks when this mode comes first?

I.e. I suggest to allow this syntax:

```diff go
+ func NewGame() *Game {
-   return &Game{
      ui: &ebitenui.UI{},
    }
  }
```
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