Goto Class/File suggests symbols from Grails plugins

Technically they're inside the project, but from user's perspective they're not

From [https://devnet.jetbrains.com/message/5545017#5545017](https://devnet.jetbrains.com/message/5545017#5545017)

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*Imported from [IDEA-140964](https://youtrack.jetbrains.com/issue/IDEA-140964) · Type: Usability Problem · Votes: 0*
*Comments, attachments, dates and reporter are not part of the export — follow the link above for the full history.*

Start by locating the implementation that supplies symbols to IntelliJ IDEA's Goto Class/File actions and trace how Grails plugin contents are included. The issue names no files or tests, so first identify the relevant entry point and existing coverage. Done means symbols from Grails plugins are excluded from these suggestions while project symbols remain available.

Written by the indexing model from the issue text.