TinyMCE gallery preview: fix errors when an image doesn't have/is smaller than thumbnail size, props gcorne, see #26959

Built from https://develop.svn.wordpress.org/trunk@27580


git-svn-id: http://core.svn.wordpress.org/trunk@27423 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/media-template.php

@@ -897,12 +897,6 @@ function wp_print_media_templates() {
 			</div>
 		</div>
 	</script>
-	<?php
-
-		//TODO: do we want to deal with the fact that the elements used for gallery items are filterable and can be overriden via shortcode attributes
-		// do we want to deal with the difference between display and edit context at all? (e.g. wptexturize() being applied to the caption.
-	?>
-
 	<script type="text/html" id="tmpl-editor-gallery">
 		<div class="toolbar">
 			<div class="dashicons dashicons-edit edit"></div>
@@ -912,14 +906,12 @@ function wp_print_media_templates() {
 			<# _.each( data.attachments, function( attachment, index ) { #>
 				<dl class="gallery-item">
 					<dt class="gallery-icon">
-						<?php // TODO: need to figure out the best way to make sure that we have thumbnails ?>
-						<img src="{{{ attachment.sizes.thumbnail.url }}}" />
+						<img src="{{{ attachment.thumbnail.url }}}" width="{{ attachment.thumbnail.width }}" height="{{ attachment.thumbnail.height }}" />
 					</dt>
 					<dd class="wp-caption-text gallery-caption">
 						{{ attachment.caption }}
 					</dd>
 				</dl>
-				<?php // this is kind silly, but copied from the gallery shortcode. Maybe it should be removed ?>
 				<# if ( index % data.columns === data.columns - 1 ) { #>
 					<br style="clear: both;">
 				<# } #>