Jabref 4.x does not show recent changes or new entries, needs reload

[jonasstein]

How to reproduce:

1. Select a group with N members
2. add a new entry (for example via doi import)
3. the group shows N+1 members, but does not list the new entry.
4. open another group, then open the old group again and the entry is displayed.

JabRef 4.0.0-dev--snapshot--2017-07-03--master--6897b10fb
Linux 4.4.0-78-generic amd64 
Java 1.8.0_131

[lenhard]

possibly related: #2787

[AEgit]

Maybe a duplicate of this (?):
#1903

[lenhard]

@AEgit Indeed, I agree. Thanks for pointing this out! It seems that the problem well before the rewrite of the grouping code, but was also not solved during the rewrite.

I'll close this one as a duplicate, but I'll leave a comment at the older issue that confirms that this is not solved even in the newer versions.