Dispatch a change event on merge

js/id/graph/history.js

@@ -35,6 +35,8 @@ iD.History = function() {
             for (var i = 0; i < stack.length; i++) {
                 stack[i].graph.rebase(entities);
             }
+
+            dispatch.change();
         },
 
         perform: function () {

js/id/renderer/map.js

@@ -102,7 +102,6 @@ iD.Map = function(context) {
 
     function connectionLoad(err, result) {
         context.history().merge(result);
-        redraw(Object.keys(result));
     }
 
     function zoomPan() {

test/spec/graph/history.js

@@ -13,6 +13,20 @@ describe("iD.History", function () {
         });
     });
 
+    describe("#merge", function () {
+        it("merges the entities into all graph versions", function () {
+            var n = iD.Node({id: 'n'});
+            history.merge({n: n});
+            expect(history.graph().entity('n')).to.equal(n);
+        });
+
+        it("emits a change event", function () {
+            history.on('change', spy);
+            history.merge({});
+            expect(spy).to.have.been.called;
+        });
+    });
+
     describe("#perform", function () {
         it("returns a difference", function () {
             expect(history.perform(action).changes()).to.eql({});