Performance improvements (#3168)

* refactor(components/status_list): Avoid quering scrollTop if not necessary

* refactor(components/dropdown_menu): Do not render items if not expanded

* refactor: Cherry-pick react-motion imports

* refactor(compose/privacy_dropdown): Do not render options if not open

* refactor(components/column_collapsable): Do not render children if collapsed

app/javascript/mastodon/features/account/components/header.js

@@ -5,7 +5,8 @@ import emojify from '../../../emoji';
 import escapeTextContentForBrowser from 'escape-html';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import IconButton from '../../../components/icon_button';
-import { Motion, spring } from 'react-motion';
+import Motion from 'react-motion/lib/Motion';
+import spring from 'react-motion/lib/spring';
 import { connect } from 'react-redux';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 

app/javascript/mastodon/features/compose/components/privacy_dropdown.js

@@ -80,7 +80,7 @@ class PrivacyDropdown extends React.PureComponent {
       <div ref={this.setRef} className={`privacy-dropdown ${open ? 'active' : ''}`}>
         <div className='privacy-dropdown__value'><IconButton className='privacy-dropdown__value-icon' icon={valueOption.icon} title={intl.formatMessage(messages.change_privacy)} size={18} active={open} inverted onClick={this.handleToggle} style={iconStyle}/></div>
         <div className='privacy-dropdown__dropdown'>
-          {options.map(item =>
+          {open && options.map(item =>
             <div role='button' tabIndex='0' key={item.value} data-index={item.value} onClick={this.handleClick} className={`privacy-dropdown__option ${item.value === value ? 'active' : ''}`}>
               <div className='privacy-dropdown__option__icon'><i className={`fa fa-fw fa-${item.icon}`} /></div>
               <div className='privacy-dropdown__option__content'>

app/javascript/mastodon/features/compose/components/upload_form.js

@@ -4,7 +4,8 @@ import PropTypes from 'prop-types';
 import IconButton from '../../../components/icon_button';
 import { defineMessages, injectIntl } from 'react-intl';
 import UploadProgressContainer from '../containers/upload_progress_container';
-import { Motion, spring } from 'react-motion';
+import Motion from 'react-motion/lib/Motion';
+import spring from 'react-motion/lib/spring';
 
 const messages = defineMessages({
   undo: { id: 'upload_form.undo', defaultMessage: 'Undo' }

app/javascript/mastodon/features/compose/components/upload_progress.js

@@ -1,6 +1,7 @@
 import React from 'react';
 import PropTypes from 'prop-types';
-import { Motion, spring } from 'react-motion';
+import Motion from 'react-motion/lib/Motion';
+import spring from 'react-motion/lib/spring';
 import { FormattedMessage } from 'react-intl';
 
 class UploadProgress extends React.PureComponent {

app/javascript/mastodon/features/compose/containers/sensitive_button_container.js

@@ -3,7 +3,8 @@ import { connect } from 'react-redux';
 import PropTypes from 'prop-types';
 import TextIconButton from '../components/text_icon_button';
 import { changeComposeSensitivity } from '../../../actions/compose';
-import { Motion, spring } from 'react-motion';
+import Motion from 'react-motion/lib/Motion';
+import spring from 'react-motion/lib/spring';
 import { injectIntl, defineMessages } from 'react-intl';
 
 const messages = defineMessages({

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

@@ -8,7 +8,8 @@ import { mountCompose, unmountCompose } from '../../actions/compose';
 import Link from 'react-router/lib/Link';
 import { injectIntl, defineMessages } from 'react-intl';
 import SearchContainer from './containers/search_container';
-import { Motion, spring } from 'react-motion';
+import Motion from 'react-motion/lib/Motion';
+import spring from 'react-motion/lib/spring';
 import SearchResultsContainer from './containers/search_results_container';
 
 const messages = defineMessages({

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

@@ -5,7 +5,8 @@ import OnboardingModal from './onboarding_modal';
 import VideoModal from './video_modal';
 import BoostModal from './boost_modal';
 import ConfirmationModal from './confirmation_modal';
-import { TransitionMotion, spring } from 'react-motion';
+import TransitionMotion from 'react-motion/lib/TransitionMotion';
+import spring from 'react-motion/lib/spring';
 
 const MODAL_COMPONENTS = {
   'MEDIA': MediaModal,

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

@@ -4,7 +4,8 @@ import PropTypes from 'prop-types';
 import ImmutablePropTypes from 'react-immutable-proptypes';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import Permalink from '../../../components/permalink';
-import { TransitionMotion, spring } from 'react-motion';
+import TransitionMotion from 'react-motion/lib/TransitionMotion';
+import spring from 'react-motion/lib/spring';
 import ComposeForm from '../../compose/components/compose_form';
 import Search from '../../compose/components/search';
 import NavigationBar from '../../compose/components/navigation_bar';

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

@@ -1,6 +1,7 @@
 import React from 'react';
 import PropTypes from 'prop-types';
-import { Motion, spring } from 'react-motion';
+import Motion from 'react-motion/lib/Motion';
+import spring from 'react-motion/lib/spring';
 import { FormattedMessage } from 'react-intl';
 
 class UploadArea extends React.PureComponent {