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/features/notifications/components/notification.js

@@ -18,6 +18,9 @@ export default class Notification extends ImmutablePureComponent {
     onMention: PropTypes.func.isRequired,
     getScrollPosition: PropTypes.func,
     updateScrollBottom: PropTypes.func,
+    cacheMediaWidth: PropTypes.func,
+    cachedMediaWidth: PropTypes.number,
+    onUnmount: PropTypes.func,
   };
 
   render () {
@@ -57,6 +60,9 @@ export default class Notification extends ImmutablePureComponent {
           contextType='notifications'
           getScrollPosition={getScrollPosition}
           updateScrollBottom={updateScrollBottom}
+          cachedMediaWidth={this.props.cachedMediaWidth}
+          cacheMediaWidth={this.props.cacheMediaWidth}
+          onUnmount={this.props.onUnmount}
           withDismiss
         />
       );
@@ -75,6 +81,9 @@ export default class Notification extends ImmutablePureComponent {
           onMention={onMention}
           getScrollPosition={getScrollPosition}
           updateScrollBottom={updateScrollBottom}
+          cachedMediaWidth={this.props.cachedMediaWidth}
+          cacheMediaWidth={this.props.cacheMediaWidth}
+          onUnmount={this.props.onUnmount}
           withDismiss
         />
       );
@@ -93,6 +102,9 @@ export default class Notification extends ImmutablePureComponent {
           onMention={onMention}
           getScrollPosition={getScrollPosition}
           updateScrollBottom={updateScrollBottom}
+          cachedMediaWidth={this.props.cachedMediaWidth}
+          cacheMediaWidth={this.props.cacheMediaWidth}
+          onUnmount={this.props.onUnmount}
           withDismiss
         />
       );

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

@@ -60,6 +60,8 @@ export default class Card extends React.PureComponent {
     maxDescription: PropTypes.number,
     onOpenMedia: PropTypes.func.isRequired,
     compact: PropTypes.bool,
+    defaultWidth: PropTypes.number,
+    cacheWidth: PropTypes.func,
   };
 
   static defaultProps = {
@@ -68,7 +70,7 @@ export default class Card extends React.PureComponent {
   };
 
   state = {
-    width: 280,
+    width: this.props.defaultWidth || 280,
     embedded: false,
   };
 
@@ -111,6 +113,7 @@ export default class Card extends React.PureComponent {
 
   setRef = c => {
     if (c) {
+      if (this.props.cacheWidth) this.props.cacheWidth(c.offsetWidth);
       this.setState({ width: c.offsetWidth });
     }
   }
@@ -133,7 +136,7 @@ export default class Card extends React.PureComponent {
   }
 
   render () {
-    const { card, maxDescription, compact } = this.props;
+    const { card, maxDescription, compact, defaultWidth } = this.props;
     const { width, embedded } = this.state;
 
     if (card === null) {

app/javascript/flavours/glitch/features/video/index.js

@@ -103,6 +103,7 @@ export default class Video extends React.PureComponent {
     inline: PropTypes.bool,
     preventPlayback: PropTypes.bool,
     intl: PropTypes.object.isRequired,
+    cacheWidth: PropTypes.func,
   };
 
   state = {
@@ -111,7 +112,7 @@ export default class Video extends React.PureComponent {
     volume: 0.5,
     paused: true,
     dragging: false,
-    containerWidth: false,
+    containerWidth: this.props.width,
     fullscreen: false,
     hovered: false,
     muted: false,
@@ -131,6 +132,7 @@ export default class Video extends React.PureComponent {
     this.player = c;
 
     if (c && c.offsetWidth && c.offsetWidth != this.state.containerWidth) {
+      if (this.props.cacheWidth) this.props.cacheWidth(this.player.offsetWidth);
       this.setState({
         containerWidth: c.offsetWidth,
       });
@@ -275,6 +277,7 @@ export default class Video extends React.PureComponent {
 
   componentDidUpdate (prevProps) {
     if (this.player && this.player.offsetWidth && this.player.offsetWidth != this.state.containerWidth && !this.state.fullscreen) {
+      if (this.props.cacheWidth) this.props.cacheWidth(this.player.offsetWidth);
       this.setState({
         containerWidth: this.player.offsetWidth,
       });