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IDE should build new JAR file if user changes JAR file attrs for given project (excluded files, compression) and starts Build action. It's not so obvious that user has to do 'Clean and Build Project'.
Could detect changes in relevant properties when properties dialog closed and offer (simple dialog) to do a Clean Project or Clean and Build Project at that time. Not planned for E.
*** Issue 51183 has been marked as a duplicate of this issue. ***
*** Issue 59652 has been marked as a duplicate of this issue. ***
I think it's more defect than enh. User can come to the state when everything works fine in the IDE but it doesn't outside (see issue 59652).
Will resolve later
NetBeans.org Migration: changing resolution from LATER to WONTFIX