Avoid two-step rendering of statuses as much as possible

Cache width shared by Video player, MediaGallery and Cards at the
ScrollableList level, pass it down through StatusList and Notifications.

app/javascript/flavours/glitch/components/media_gallery.js

@@ -224,6 +224,8 @@ export default class MediaGallery extends React.PureComponent {
     size: PropTypes.object,
     onOpenMedia: PropTypes.func.isRequired,
     intl: PropTypes.object.isRequired,
+    defaultWidth: PropTypes.number,
+    cacheWidth: PropTypes.func,
   };
 
   static defaultProps = {
@@ -232,6 +234,7 @@ export default class MediaGallery extends React.PureComponent {
 
   state = {
     visible: this.props.revealed === undefined ? (displayMedia !== 'hide_all' && !this.props.sensitive || displayMedia === 'show_all') : this.props.revealed,
+    width: this.props.defaultWidth,
   };
 
   componentWillReceiveProps (nextProps) {
@@ -259,6 +262,7 @@ export default class MediaGallery extends React.PureComponent {
   handleRef = (node) => {
     this.node = node;
     if (node && node.offsetWidth && node.offsetWidth != this.state.width) {
+      if (this.props.cacheWidth) this.props.cacheWidth(node.offsetWidth);
       this.setState({
         width: node.offsetWidth,
       });
@@ -271,10 +275,12 @@ export default class MediaGallery extends React.PureComponent {
   }
 
   render () {
-    const { media, intl, sensitive, letterbox, fullwidth } = this.props;
-    const { width, visible } = this.state;
+    const { media, intl, sensitive, letterbox, fullwidth, defaultWidth } = this.props;
+    const { visible } = this.state;
     const size = media.take(4).size;
 
+    const width = this.state.width || defaultWidth;
+
     let children;
 
     const style = {};

app/javascript/flavours/glitch/components/scrollable_list.js

@@ -40,6 +40,7 @@ export default class ScrollableList extends PureComponent {
 
   state = {
     fullscreen: null,
+    cachedMediaWidth: 300,
   };
 
   intersectionObserverWrapper = new IntersectionObserverWrapper();
@@ -141,6 +142,10 @@ export default class ScrollableList extends PureComponent {
     this.setScrollTop(newScrollTop);
   }
 
+  cacheMediaWidth = (width) => {
+    if (width && this.state.cachedMediaWidth != width) this.setState({ cachedMediaWidth: width });
+  }
+
   getSnapshotBeforeUpdate (prevProps, prevState) {
     const someItemInserted = React.Children.count(prevProps.children) > 0 &&
       React.Children.count(prevProps.children) < React.Children.count(this.props.children) &&
@@ -252,7 +257,12 @@ export default class ScrollableList extends PureComponent {
                 intersectionObserverWrapper={this.intersectionObserverWrapper}
                 saveHeightKey={trackScroll ? `${this.context.router.route.location.key}:${scrollKey}` : null}
               >
-                {React.cloneElement(child, {getScrollPosition: this.getScrollPosition, updateScrollBottom: this.updateScrollBottom})}
+                {React.cloneElement(child, {
+                  getScrollPosition: this.getScrollPosition,
+                  updateScrollBottom: this.updateScrollBottom,
+                  cachedMediaWidth: this.state.cachedMediaWidth,
+                  cacheMediaWidth: this.cacheMediaWidth,
+                })}
               </IntersectionObserverArticleContainer>
             ))}
 

app/javascript/flavours/glitch/components/status.js

@@ -72,6 +72,8 @@ export default class Status extends ImmutablePureComponent {
     updateScrollBottom: PropTypes.func,
     expanded: PropTypes.bool,
     intl: PropTypes.object.isRequired,
+    cacheMediaWidth: PropTypes.func,
+    cachedMediaWidth: PropTypes.number,
   };
 
   state = {
@@ -445,6 +447,8 @@ export default class Status extends ImmutablePureComponent {
               fullwidth={settings.getIn(['media', 'fullwidth'])}
               preventPlayback={isCollapsed || !isExpanded}
               onOpenVideo={this.handleOpenVideo}
+              width={this.props.cachedMediaWidth}
+              cacheWidth={this.props.cacheMediaWidth}
             />)}
           </Bundle>
         );
@@ -460,6 +464,8 @@ export default class Status extends ImmutablePureComponent {
                 fullwidth={settings.getIn(['media', 'fullwidth'])}
                 hidden={isCollapsed || !isExpanded}
                 onOpenMedia={this.props.onOpenMedia}
+                cacheWidth={this.props.cacheMediaWidth}
+                defaultWidth={this.props.cachedMediaWidth}
               />
             )}
           </Bundle>
@@ -476,6 +482,8 @@ export default class Status extends ImmutablePureComponent {
           onOpenMedia={this.props.onOpenMedia}
           card={status.get('card')}
           compact
+          cacheWidth={this.props.cacheMediaWidth}
+          defaultWidth={this.props.cachedMediaWidth}
         />
       );
       mediaIcon = 'link';