Fix #1120, inconsistent undo for line/area drawing

Gulp!

js/id/behavior/draw_way.js

@@ -44,6 +44,7 @@ iD.behavior.DrawWay = function(context, wayId, index, mode, baseGraph) {
     }
 
     function undone() {
+        finished = true;
         context.enter(iD.modes.Browse(context));
     }
 

js/id/core/history.js

@@ -89,12 +89,6 @@ iD.History = function(context) {
         undo: function() {
             var previous = stack[index].graph;
 
-            // Pop to the first annotated state.
-            while (index > 0) {
-                if (stack[index].annotation) break;
-                index--;
-            }
-
             // Pop to the next annotated state.
             while (index > 0) {
                 index--;

test/spec/core/history.js

@@ -132,13 +132,6 @@ describe("iD.History", function () {
             expect(history.undoAnnotation()).to.be.undefined;
         });
 
-        it("pops past unannotated states", function () {
-            history.perform(action, "annotation");
-            history.perform(action);
-            history.undo();
-            expect(history.undoAnnotation()).to.be.undefined;
-        });
-
         it("pushes the redo stack", function () {
             history.perform(action, "annotation");
             history.undo();