Use CSS to constrain auto-oriented images

js/views/attachment_view.js

@@ -22,11 +22,6 @@
           this.update();
         }, {
           orientation: true,
-          // From CSS:
-          // maxWidth: 30em --> 420px
-          // maxHeight: 300px
-          maxWidth: 420,
-          maxHeight: 300,
         });
       },
       events: {

stylesheets/_conversation.scss

@@ -568,7 +568,10 @@ span.status {
       background-color: #ccc;
     }
 
-    img, audio, video {
+    img,
+    canvas, /* used for auto-oriented images from `loadImage` */
+    audio,
+    video {
       max-width: 100%;
       max-height: 300px;
     }