If there is context with an alias present and ENABLE-APP is called with a new alias and the old one, another virtual host is added instead of merging with the existing one.

Eg.

 
context: /test
alias: something

then ENABLE comes with Alias=else,something and we'll get

context: /test
alias: something
---
context: /test
alias: else, something

The correct behavior should be

context: /test
alias: something, else