Fix home regeneration (#6251)

* Fix regeneration marker not being removed after completion

* Return HTTP 206 from /api/v1/timelines/home if regeneration in progress
Prioritize RegenerationWorker by putting it into default queue

* Display loading indicator and poll home timeline while it regenerates

* Add graphic to regeneration message

* Make "not found" indicator consistent with home regeneration

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

@@ -1,6 +1,6 @@
 import React from 'react';
 import { connect } from 'react-redux';
-import { expandHomeTimeline } from '../../actions/timelines';
+import { expandHomeTimeline, refreshHomeTimeline } from '../../actions/timelines';
 import PropTypes from 'prop-types';
 import StatusListContainer from '../ui/containers/status_list_container';
 import Column from '../../components/column';
@@ -16,6 +16,7 @@ const messages = defineMessages({
 
 const mapStateToProps = state => ({
   hasUnread: state.getIn(['timelines', 'home', 'unread']) > 0,
+  isPartial: state.getIn(['timelines', 'home', 'isPartial'], false),
 });
 
 @connect(mapStateToProps)
@@ -26,6 +27,7 @@ export default class HomeTimeline extends React.PureComponent {
     dispatch: PropTypes.func.isRequired,
     intl: PropTypes.object.isRequired,
     hasUnread: PropTypes.bool,
+    isPartial: PropTypes.bool,
     columnId: PropTypes.string,
     multiColumn: PropTypes.bool,
   };
@@ -57,6 +59,39 @@ export default class HomeTimeline extends React.PureComponent {
     this.props.dispatch(expandHomeTimeline());
   }
 
+  componentDidMount () {
+    this._checkIfReloadNeeded(false, this.props.isPartial);
+  }
+
+  componentDidUpdate (prevProps) {
+    this._checkIfReloadNeeded(prevProps.isPartial, this.props.isPartial);
+  }
+
+  componentWillUnmount () {
+    this._stopPolling();
+  }
+
+  _checkIfReloadNeeded (wasPartial, isPartial) {
+    const { dispatch } = this.props;
+
+    if (wasPartial === isPartial) {
+      return;
+    } else if (!wasPartial && isPartial) {
+      this.polling = setInterval(() => {
+        dispatch(refreshHomeTimeline());
+      }, 3000);
+    } else if (wasPartial && !isPartial) {
+      this._stopPolling();
+    }
+  }
+
+  _stopPolling () {
+    if (this.polling) {
+      clearInterval(this.polling);
+      this.polling = null;
+    }
+  }
+
   render () {
     const { intl, hasUnread, columnId, multiColumn } = this.props;
     const pinned = !!columnId;