Wrong layout for `Alt` nested in `Creation`

[MrCoder]

new A(x) {
  if (condition){
    B.method()
  }
}

It also has impact on other fragment components:

1. Loop
2. Par
3. Opt
4. TCF (try/catch/finally)

It does not have impact on:

1. simple message (sync and async)
2. creation
3. return/reply

[MrCoder]

Being a defect in the core, it has impact on all products:

1. Confluence;
2. JetBrains IDE plugins
3. Chrome Extension;
4. Web App;
5. ZenUML.cn.

This is a medium to low bug as it only impact in a specific combination: Fragment under Creation. I would assume less than 10% diagrams use Creation, under which less than 5% will use a Fragment.

So we will fix it in the core (though there are quick fixes in each products).

[MrCoder]

So we will fix it in the core (though there are quick fixes in each products).

It turns out the proper fix is very complex on Confluence because confluence use a deeply coupled store. Let's fix it with a quick CSS fix on Confluence. It is not a high priority to fix it but since we are releasing other changes (generic viewer), let's fix it in the same release.