When you click Quote Reply, and then cancel the reply, don't ask if you're sure.

app/assets/javascripts/discourse/controllers/quote_button_controller.js

@@ -117,12 +117,11 @@ Discourse.QuoteButtonController = Discourse.Controller.extend({
 
     var buffer = this.get('buffer');
     var quotedText = Discourse.Quote.build(post, buffer);
+    composerOpts.quote = quotedText;
     if (composerController.get('content.replyDirty')) {
       composerController.appendText(quotedText);
     } else {
-      composerController.open(composerOpts).then(function() {
-        composerController.appendText(quotedText);
-      });
+      composerController.open(composerOpts);
     }
     this.set('buffer', '');
     return false;

app/assets/javascripts/discourse/models/composer.js

@@ -361,6 +361,11 @@ Discourse.Composer = Discourse.Model.extend({
           loading: false
         });
       });
+    } else if (opts.action === REPLY && opts.quote) {
+      this.setProperties({
+        reply: opts.quote,
+        originalText: opts.quote
+      });
     }
     if (opts.title) { this.set('title', opts.title); }
     this.set('originalText', opts.draft ? '' : this.get('reply'));

test/javascripts/models/composer_test.js

@@ -204,3 +204,13 @@ test('showPreview', function() {
   Discourse.Mobile.mobileView = false;
   equal(new_composer().get('showPreview'), true, "Show preview by default in desktop view");
 });
+
+test('open with a quote', function() {
+  var quote = '[quote="neil, post:5, topic:413"]\nSimmer down you two.\n[/quote]';
+  var new_composer = function() {
+    return Discourse.Composer.open({action: Discourse.Composer.REPLY, draftKey: 'asfd', draftSequence: 1, quote: quote});
+  };
+
+  equal(new_composer().get('originalText'), quote, "originalText is the quote" );
+  equal(new_composer().get('replyDirty'), false, "replyDirty is initally false with a quote" );
+});