Grails: user defined config properties could be resolved and suggested by completion in controllers

Provide a Grails application module.
Provide grails-app/conf/Config.groovy with user defined properties like:
```
environments {
ideatest {
my.own.secret = "Secret property string."
}
}
my.own.secret2 = "Secret property string 2."
```
Provide a reference to them in grails-app/controllers/AnyController:
```
def sample = {
render "

$ConfigurationHolder.config.my.own.secret

"
render "

$ConfigurationHolder.config.my.own.secret2

"
}
```
Try completion after "$ConfigurationHolder.config.": they suggest predefined Grails properties like "grails.views.gsp.encoding", but not user defined properties.
108.578.

---

*Imported from [IDEA-71624](https://youtrack.jetbrains.com/issue/IDEA-71624) · Type: Feature · Votes: 0*
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Start with the grails-app/conf/Config.groovy example and the grails-app/controllers/AnyController reference, then reproduce completion after "$ConfigurationHolder.config.". Trace how predefined Grails properties are suggested and make user-defined properties available there; done means both sample properties appear in completion.

Written by the indexing model from the issue text.