Grails: Run Grails Target: quick doc for all targets shows dummy text

Get a module with grails application. Run Grails Target (Ctrl+Alt+G).
Type any target's name (e.g. create-controller).
Put cursor on the name. Ctrl+Q.
The quick doc popup opens, but shows just the following text: "\Dummy.txt".

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*Imported from [IDEA-49590](https://youtrack.jetbrains.com/issue/IDEA-49590) · Type: Usability Problem · Votes: 0*
*Comments, attachments, dates and reporter are not part of the export — follow the link above for the full history.*

Reproduce the issue in a module with a Grails application by opening Run Grails Target (Ctrl+Alt+G), selecting a target such as create-controller, and invoking Quick Documentation with Ctrl+Q. Trace the quick-documentation entry point for Grails targets; done means the popup shows the target's documentation instead of "\\Dummy.txt".

Written by the indexing model from the issue text.