Fix unnecessary re-rendering of various components when typing in web UI (#15286)

app/javascript/mastodon/components/status.js

@@ -97,7 +97,7 @@ class Status extends ImmutablePureComponent {
     cachedMediaWidth: PropTypes.number,
     scrollKey: PropTypes.string,
     deployPictureInPicture: PropTypes.func,
-    pictureInPicture: PropTypes.shape({
+    pictureInPicture: ImmutablePropTypes.contains({
       inUse: PropTypes.bool,
       available: PropTypes.bool,
     }),
@@ -354,7 +354,7 @@ class Status extends ImmutablePureComponent {
       status  = status.get('reblog');
     }
 
-    if (pictureInPicture.inUse) {
+    if (pictureInPicture.get('inUse')) {
       media = <PictureInPicturePlaceholder width={this.props.cachedMediaWidth} />;
     } else if (status.get('media_attachments').size > 0) {
       if (this.props.muted) {
@@ -381,7 +381,7 @@ class Status extends ImmutablePureComponent {
                 width={this.props.cachedMediaWidth}
                 height={110}
                 cacheWidth={this.props.cacheMediaWidth}
-                deployPictureInPicture={pictureInPicture.available ? this.handleDeployPictureInPicture : undefined}
+                deployPictureInPicture={pictureInPicture.get('available') ? this.handleDeployPictureInPicture : undefined}
               />
             )}
           </Bundle>
@@ -404,7 +404,7 @@ class Status extends ImmutablePureComponent {
                 sensitive={status.get('sensitive')}
                 onOpenVideo={this.handleOpenVideo}
                 cacheWidth={this.props.cacheMediaWidth}
-                deployPictureInPicture={pictureInPicture.available ? this.handleDeployPictureInPicture : undefined}
+                deployPictureInPicture={pictureInPicture.get('available') ? this.handleDeployPictureInPicture : undefined}
                 visible={this.state.showMedia}
                 onToggleVisibility={this.handleToggleMediaVisibility}
               />

app/javascript/mastodon/containers/status_container.js

@@ -1,7 +1,7 @@
 import React from 'react';
 import { connect } from 'react-redux';
 import Status from '../components/status';
-import { makeGetStatus } from '../selectors';
+import { makeGetStatus, makeGetPictureInPicture } from '../selectors';
 import {
   replyCompose,
   mentionCompose,
@@ -54,14 +54,11 @@ const messages = defineMessages({
 
 const makeMapStateToProps = () => {
   const getStatus = makeGetStatus();
+  const getPictureInPicture = makeGetPictureInPicture();
 
   const mapStateToProps = (state, props) => ({
     status: getStatus(state, props),
-
-    pictureInPicture: {
-      inUse: state.getIn(['meta', 'layout']) !== 'mobile' && state.get('picture_in_picture').statusId === props.id,
-      available: state.getIn(['meta', 'layout']) !== 'mobile',
-    },
+    pictureInPicture: getPictureInPicture(state, props),
   });
 
   return mapStateToProps;

app/javascript/mastodon/features/status/components/detailed_status.js

@@ -41,7 +41,10 @@ class DetailedStatus extends ImmutablePureComponent {
     domain: PropTypes.string.isRequired,
     compact: PropTypes.bool,
     showMedia: PropTypes.bool,
-    usingPiP: PropTypes.bool,
+    pictureInPicture: ImmutablePropTypes.contains({
+      inUse: PropTypes.bool,
+      available: PropTypes.bool,
+    }),
     onToggleMediaVisibility: PropTypes.func,
   };
 
@@ -102,7 +105,7 @@ class DetailedStatus extends ImmutablePureComponent {
   render () {
     const status = (this.props.status && this.props.status.get('reblog')) ? this.props.status.get('reblog') : this.props.status;
     const outerStyle = { boxSizing: 'border-box' };
-    const { intl, compact, usingPiP } = this.props;
+    const { intl, compact, pictureInPicture } = this.props;
 
     if (!status) {
       return null;
@@ -118,7 +121,7 @@ class DetailedStatus extends ImmutablePureComponent {
       outerStyle.height = `${this.state.height}px`;
     }
 
-    if (usingPiP) {
+    if (pictureInPicture.get('inUse')) {
       media = <PictureInPicturePlaceholder />;
     } else if (status.get('media_attachments').size > 0) {
       if (status.getIn(['media_attachments', 0, 'type']) === 'audio') {

app/javascript/mastodon/features/status/index.js

@@ -43,7 +43,7 @@ import {
 import { initMuteModal } from '../../actions/mutes';
 import { initBlockModal } from '../../actions/blocks';
 import { initReport } from '../../actions/reports';
-import { makeGetStatus } from '../../selectors';
+import { makeGetStatus, makeGetPictureInPicture } from '../../selectors';
 import { ScrollContainer } from 'react-router-scroll-4';
 import ColumnBackButton from '../../components/column_back_button';
 import ColumnHeader from '../../components/column_header';
@@ -72,6 +72,7 @@ const messages = defineMessages({
 
 const makeMapStateToProps = () => {
   const getStatus = makeGetStatus();
+  const getPictureInPicture = makeGetPictureInPicture();
 
   const getAncestorsIds = createSelector([
     (_, { id }) => id,
@@ -129,6 +130,7 @@ const makeMapStateToProps = () => {
 
   const mapStateToProps = (state, props) => {
     const status = getStatus(state, { id: props.params.statusId });
+
     let ancestorsIds   = Immutable.List();
     let descendantsIds = Immutable.List();
 
@@ -143,7 +145,7 @@ const makeMapStateToProps = () => {
       descendantsIds,
       askReplyConfirmation: state.getIn(['compose', 'text']).trim().length !== 0,
       domain: state.getIn(['meta', 'domain']),
-      usingPiP: state.get('picture_in_picture').statusId === props.params.statusId,
+      pictureInPicture: getPictureInPicture(state, { id: props.params.statusId }),
     };
   };
 
@@ -168,7 +170,10 @@ class Status extends ImmutablePureComponent {
     askReplyConfirmation: PropTypes.bool,
     multiColumn: PropTypes.bool,
     domain: PropTypes.string.isRequired,
-    usingPiP: PropTypes.bool,
+    pictureInPicture: ImmutablePropTypes.contains({
+      inUse: PropTypes.bool,
+      available: PropTypes.bool,
+    }),
   };
 
   state = {
@@ -492,7 +497,7 @@ class Status extends ImmutablePureComponent {
 
   render () {
     let ancestors, descendants;
-    const { shouldUpdateScroll, status, ancestorsIds, descendantsIds, intl, domain, multiColumn, usingPiP } = this.props;
+    const { shouldUpdateScroll, status, ancestorsIds, descendantsIds, intl, domain, multiColumn, pictureInPicture } = this.props;
     const { fullscreen } = this.state;
 
     if (status === null) {
@@ -550,7 +555,7 @@ class Status extends ImmutablePureComponent {
                   domain={domain}
                   showMedia={this.state.showMedia}
                   onToggleMediaVisibility={this.handleToggleMediaVisibility}
-                  usingPiP={usingPiP}
+                  pictureInPicture={pictureInPicture}
                 />
 
                 <ActionBar

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

@@ -99,9 +99,14 @@ class ColumnsArea extends ImmutablePureComponent {
     if (this.props.singleColumn !== prevProps.singleColumn && !this.props.singleColumn) {
       this.node.addEventListener('wheel', this.handleWheel, supportsPassiveEvents ? { passive: true } : false);
     }
-    this.lastIndex = getIndex(this.context.router.history.location.pathname);
+
+    const newIndex = getIndex(this.context.router.history.location.pathname);
+
+    if (this.lastIndex !== newIndex) {
+      this.lastIndex = newIndex;
       this.setState({ shouldAnimate: true });
     }
+  }
 
   componentWillUnmount () {
     if (!this.props.singleColumn) {

app/javascript/mastodon/selectors/index.js

@@ -1,5 +1,5 @@
 import { createSelector } from 'reselect';
-import { List as ImmutableList, is } from 'immutable';
+import { List as ImmutableList, Map as ImmutableMap, is } from 'immutable';
 import { me } from '../initial_state';
 
 const getAccountBase         = (state, id) => state.getIn(['accounts', id], null);
@@ -121,6 +121,16 @@ export const makeGetStatus = () => {
   );
 };
 
+export const makeGetPictureInPicture = () => {
+  return createSelector([
+    (state, { id }) => state.get('picture_in_picture').statusId === id,
+    (state) => state.getIn(['meta', 'layout']) !== 'mobile',
+  ], (inUse, available) => ImmutableMap({
+    inUse: inUse && available,
+    available,
+  }));
+};
+
 const getAlertsBase = state => state.get('alerts');
 
 export const getAlerts = createSelector([getAlertsBase], (base) => {