Grails: Project / Grails view doesn't update content of default packages until first manual synchronization

Create a new project / module with grails application.
Add some files into default packages (either domain, controller, services or taglib).
Project / Grails view won't update content of these folders until pressing synchronize button of moving focus away from IDEA and back.
After Project / Grails view was once synchronized it updates itself on it's own.

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*Imported from [IDEA-49684](https://youtrack.jetbrains.com/issue/IDEA-49684) · Type: Bug · Votes: 1*
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Reproduce the issue in IntelliJ IDEA by creating a Grails project or module, adding files to the default domain, controller, services, or taglib packages, and checking the Project / Grails view. Trace the view's synchronization or refresh entry point; done means newly added files appear automatically before manual synchronization or changing focus.

Written by the indexing model from the issue text.