The above answer (configuration change in settings) caused all methods provided by aj cannot be detected by Intellij and cause an error here and there. Setting up a new area seems to be the best answer.
Use "Change scopes" in the settings of the project sidebar (see settings β Project settings β Scopes) Add a new scope, for example. "Non-Roo" with a drawing like "! * _ Roo _ *"
You can then switch between the two areas to show / hide Roo files.
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