trigger the input event after swapping out the preview image for the real one.

Author: scashin133

src/js/images.js

@@ -359,17 +359,20 @@
 
     Images.prototype.showImage = function (img, data) {
         var $place = this.$el.find('.medium-insert-active'),
-            domImage;
+            domImage,
+            that;
 
         // Hide editor's placeholder
         $place.click();
 
         // If preview is allowed and preview image already exists,
         // replace it with uploaded image
+        that = this;
         if (this.options.preview && data.context) {
             domImage = this.getDOMImage();
             domImage.onload = function () {
                 data.context.find('img').attr('src', domImage.src);
+                that.$el.trigger('input');
             };
             domImage.src = img;
         } else {

test/images.js

@@ -171,6 +171,36 @@ asyncTest('triggering input event on showImage', function () {
     });
 });
 
+asyncTest('triggering input event twice on showImage for preview', function (assert) {
+    var that = this,
+        inputTriggerCount = 0,
+        stubbedImage,
+        context;
+
+    stubbedImage = sinon.stub();
+    sinon.stub(this.addon, 'getDOMImage').returns(stubbedImage);
+    context = this.$el.prepend('<div class="medium-insert-images medium-insert-active">'+
+        '<figure><img src="data:" alt=""></figure>'+
+    '</div>');
+
+    assert.expect(2);
+    this.$el.on('input', function () {
+        if (inputTriggerCount === 0)
+            start();
+        if (inputTriggerCount === 2) {
+            that.$el.off('input');
+        } else {
+            inputTriggerCount++;
+        }
+        ok(1, 'input triggered');
+    });
+
+    this.addon.showImage('http://image.co', {
+        context: context
+    });
+    stubbedImage.onload();
+});
+
 test('selecting image', function () {
     this.$el.find('p')
         .addClass('medium-insert-images')
@@ -451,4 +481,4 @@ test('editor\'s serialize removes also contenteditable attr', function () {
 
     equal(editor.serialize()['element-0'].value, html, 'contenteditable attr were removed');
 });
-*/
+*/