neilcsmith-net commented on pull request #3136:
URL: https://github.com/apache/netbeans/pull/3136#issuecomment-908237054


   Doesn't this need the same change to take the notifications outside of the 
lock in `LazyLookupProviders`?  Looking at the stack traces provided with 
NETBEANS-5914, all the threads with the `DelegatingLookupImpl` lock are stuck 
in `collectFires()` - that won't change with this will it?  It's before the 
async notification - 
https://github.com/apache/netbeans/blob/master/platform/openide.util.lookup/src/org/openide/util/lookup/ProxyLookup.java#L228
  They are all in a listener call from a `LazyLookupProvider` under lock though.


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