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at the moment 'generic' source groups contain all files under the project root. however i think that files/folders excluded from the project shouldn't be in these source groups.
SourcesHelper currently does not modify the implicit generic group according to excludes specified in explicit groups which happen to be beneath it. J2SESources calls addPrincipalSourceRoot with appropriate includes and excludes for each JAVA-type root, whether or not it is external, so it should suffice for SH to only pay attention to untyped roots. Needs to be confirmed that freeform projects will also behave properly in this respect (when configured through the GUI). JDK's j2se/make/netbeans/common/*-sources.ent currently do not mark excludes on untyped source roots, at the request of folks who specifically wanted to see everything in the Files tab. Can probably be changed.
*** Issue 114287 has been marked as a duplicate of this issue. ***
Probably too risky to make such a significant change this late.
No known use case, and potentially detrimental to performance.