Emit release cursor for more commands

It should be rare that repeated use of these commands would grow the
Raft log excessively but just incase we evaluate the release cursors
here anyway so that if the queue is empty we may trigger a snapshot
anyway.

Author: kjnilsson

deps/rabbit/src/rabbit_fifo.erl

@@ -509,13 +509,14 @@ apply(Meta, {nodeup, Node}, #?MODULE{consumers = Cons0,
     checkout(Meta, State0, State, Effects);
 apply(_, {nodedown, _Node}, State) ->
     {State, ok};
-apply(Meta, #purge_nodes{nodes = Nodes}, State0) ->
+apply(#{index := Idx} = Meta, #purge_nodes{nodes = Nodes}, State0) ->
     {State, Effects} = lists:foldl(fun(Node, {S, E}) ->
                                            purge_node(Meta, Node, S, E)
                                    end, {State0, []}, Nodes),
-    {State, ok, Effects};
-apply(Meta, #update_config{config = Conf}, State) ->
-    checkout(Meta, State, update_config(Conf, State), []);
+    update_smallest_raft_index(Idx, ok, State, Effects);
+apply(#{index := Idx} = Meta, #update_config{config = Conf}, State0) ->
+    {State, Reply, Effects} = checkout(Meta, State0, update_config(Conf, State0), []),
+    update_smallest_raft_index(Idx, Reply, State, Effects);
 apply(_Meta, {machine_version, 0, 1}, V0State) ->
     State = convert_v0_to_v1(V0State),
     {State, ok, []};