fix(components/media_modal): Aspect ratio (#4128)

* fix(components/media_modal): Aspect ratio

* fix: Remove useless style

app/javascript/mastodon/features/ui/components/image_loader.js

@@ -133,6 +133,7 @@ export default class ImageLoader extends React.PureComponent {
           width={width}
           height={height}
           ref={this.setCanvasRef}
+          style={{ opacity: loading ? 1 : 0 }}
         />
 
         {!loading && (

app/javascript/mastodon/features/ui/components/media_modal.js

@@ -94,7 +94,7 @@ export default class MediaModal extends ImmutablePureComponent {
 
         <div className='media-modal__content'>
           <IconButton className='media-modal__close' title={intl.formatMessage(messages.close)} icon='times' onClick={onClose} size={16} />
-          <ReactSwipeableViews onChangeIndex={this.handleSwipe} index={index}>
+          <ReactSwipeableViews onChangeIndex={this.handleSwipe} index={index} animateHeight>
             {content}
           </ReactSwipeableViews>
         </div>

app/javascript/styles/components.scss

@@ -2935,6 +2935,7 @@ button.icon-button.active i.fa-retweet {
   canvas {
     display: block;
     background: url('../images/void.png') repeat;
+    object-fit: contain;
   }
 }