[BUGFIX beta] update lastValue of AttrNode even when not rerendering

Fixes 10541

packages/ember-htmlbars/tests/helpers/input_test.js

@@ -102,6 +102,26 @@ QUnit.test("cursor position is not lost when updating content", function() {
   equal(input.selectionEnd, 3, 'cursor position was not lost');
 });
 
+QUnit.test("input can be updated multiple times", function() {
+  equal(view.$('input').val(), "hello", "precondition - renders text field with value");
+
+  var $input = view.$('input');
+  var input = $input[0];
+
+  run(null, set, controller, 'val', '');
+  equal(view.$('input').val(), "", "updates first time");
+
+  // Simulates setting the input to the same value as it already is which won't cause a rerender
+  run(function() {
+    input.value = 'derp';
+  });
+  run(null, set, controller, 'val', 'derp');
+  equal(view.$('input').val(), "derp", "updates second time");
+
+  run(null, set, controller, 'val', '');
+  equal(view.$('input').val(), "", "updates third time");
+});
+
 
 QUnit.module("{{input type='text'}} - static values", {
   setup: function() {

packages/ember-views/lib/attr_nodes/attr_node.js

@@ -53,6 +53,7 @@ AttrNode.prototype.render = function render(buffer) {
 
   // If user is typing in a value we don't want to rerender and loose cursor position.
   if (this.attrName === 'value' && this._morph.element.value === value) {
+    this.lastValue = value;
     return;
   }