Fix #428 nested if else rendering

The program equality checker was not taking children into account
when determining equality, causing breakages under similar cases.

dist/handlebars.js

@@ -897,6 +897,17 @@ Compiler.prototype = {
         }
       }
     }
+
+    len = this.children.length;
+    if (other.children.length !== len) {
+      return false;
+    }
+    for (i = 0; i < len; i++) {
+      if (!this.children[i].equals(other.children[i])) {
+        return false;
+      }
+    }
+
     return true;
   },
 

lib/handlebars/compiler/compiler.js

@@ -59,6 +59,17 @@ Compiler.prototype = {
         }
       }
     }
+
+    len = this.children.length;
+    if (other.children.length !== len) {
+      return false;
+    }
+    for (i = 0; i < len; i++) {
+      if (!this.children[i].equals(other.children[i])) {
+        return false;
+      }
+    }
+
     return true;
   },
 

spec/qunit_spec.js

@@ -1384,3 +1384,16 @@ test('GH-408: Multiple loops fail', function() {
   var result = template(context);
   equals(result, "John DoeJane DoeJohn DoeJane DoeJohn DoeJane Doe", 'It should output multiple times');
 });
+
+test('GS-428: Nested if else rendering', function() {
+  var succeedingTemplate = '{{#inverse}} {{#blk}} Unexpected {{/blk}} {{else}}  {{#blk}} Expected {{/blk}} {{/inverse}}';
+  var failingTemplate = '{{#inverse}} {{#blk}} Unexpected {{/blk}} {{else}} {{#blk}} Expected {{/blk}} {{/inverse}}';
+
+  var helpers = {
+    blk: function(block) { return block.fn(''); },
+    inverse: function(block) { return block.inverse(''); }
+  };
+
+  shouldCompileTo(succeedingTemplate, [{}, helpers], '   Expected  ');
+  shouldCompileTo(failingTemplate, [{}, helpers], '  Expected  ');
+});