File backends started as part of a trace have a loglevel of 'none'

src/lager.erl

@@ -115,7 +115,7 @@ trace_file(File, Filter, Level) ->
                 false ->
                     %% install the handler
                     supervisor:start_child(lager_handler_watcher_sup,
-                        [lager_event, {lager_file_backend, File}, {File, Level}]);
+                        [lager_event, {lager_file_backend, File}, {File, none}]);
                 _ ->
                     {ok, exists}
             end,

src/lager_file_backend.erl

@@ -412,6 +412,8 @@ filesystem_test_() ->
                         file:delete("foo.log"),
                         {ok, _} = lager:trace_file("foo.log", [{module, ?MODULE}]),
                         lager:error("Test message"),
+                        %% not elegible for trace
+                        lager:log(error, self(), "Test message"),
                         {ok, Bin3} = file:read_file("foo.log"),
                         ?assertMatch([_, _, "[error]", _, "Test message\n"], re:split(Bin3, " ", [{return, list}, {parts, 5}]))
                 end