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There is no way how other module could veto project action invocation. I'm ataching a patch that allows that. I thought I would use it, but I implemented that differently. Implementation(s) of InvokeActionVerifier is (are) supposed to be registered via META-INF/services from other modules. It might be useful sometime.
Created attachment 36664 [details] patch file
I forgot to mention that it would be probably friend API in j2seproject.