Fix null error in status component when determining showMedia state (#10838)

* Fix null error in status component when determining showMedia state

Also update the showMedia value if the status passed to the
component changes

* Refactor media visibility computation into a defaultMediaVisibility function

* Fix default media visibility with reblogs

app/javascript/mastodon/components/status.js

@@ -18,6 +18,7 @@ import classNames from 'classnames';
 import Icon from 'mastodon/components/icon';
 import PollContainer from 'mastodon/containers/poll_container';
 import { displayMedia } from '../initial_state';
+import { is } from 'immutable';
 
 // We use the component (and not the container) since we do not want
 // to use the progress bar to show download progress
@@ -40,6 +41,18 @@ export const textForScreenReader = (intl, status, rebloggedByText = false) => {
   return values.join(', ');
 };
 
+export const defaultMediaVisibility = (status) => {
+  if (!status) {
+    return undefined;
+  }
+
+  if (status.get('reblog', null) !== null && typeof status.get('reblog') === 'object') {
+    status = status.get('reblog');
+  }
+
+  return (displayMedia !== 'hide_all' && !status.get('sensitive') || displayMedia === 'show_all');
+};
+
 export default @injectIntl
 class Status extends ImmutablePureComponent {
 
@@ -87,7 +100,7 @@ class Status extends ImmutablePureComponent {
   ];
 
   state = {
-    showMedia: displayMedia !== 'hide_all' && !this.props.status.get('sensitive') || displayMedia === 'show_all',
+    showMedia: defaultMediaVisibility(this.props.status),
   };
 
   // Track height changes we know about to compensate scrolling
@@ -103,11 +116,19 @@ class Status extends ImmutablePureComponent {
     }
   }
 
+  componentWillReceiveProps (nextProps) {
+    if (!is(nextProps.status, this.props.status) && nextProps.status) {
+      this.setState({ showMedia: defaultMediaVisibility(nextProps.status) });
+    }
+  }
+
   // Compensate height changes
   componentDidUpdate (prevProps, prevState, snapshot) {
     const doShowCard  = !this.props.muted && !this.props.hidden && this.props.status && this.props.status.get('card');
+
     if (doShowCard && !this.didShowCard) {
       this.didShowCard = true;
+
       if (snapshot !== null && this.props.updateScrollBottom) {
         if (this.node && this.node.offsetTop < snapshot.top) {
           this.props.updateScrollBottom(snapshot.height - snapshot.top);

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

@@ -41,9 +41,9 @@ import { openModal } from '../../actions/modal';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import { HotKeys } from 'react-hotkeys';
-import { boostModal, deleteModal, displayMedia } from '../../initial_state';
+import { boostModal, deleteModal } from '../../initial_state';
 import { attachFullscreenListener, detachFullscreenListener, isFullscreen } from '../ui/util/fullscreen';
-import { textForScreenReader } from '../../components/status';
+import { textForScreenReader, defaultMediaVisibility } from '../../components/status';
 import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
@@ -131,7 +131,7 @@ class Status extends ImmutablePureComponent {
 
   state = {
     fullscreen: false,
-    showMedia: !this.props.status ? undefined : (displayMedia !== 'hide_all' && !this.props.status.get('sensitive') || displayMedia === 'show_all'),
+    showMedia: defaultMediaVisibility(this.props.status),
   };
 
   componentWillMount () {
@@ -147,8 +147,9 @@ class Status extends ImmutablePureComponent {
       this._scrolledIntoView = false;
       this.props.dispatch(fetchStatus(nextProps.params.statusId));
     }
+
     if (!Immutable.is(nextProps.status, this.props.status) && nextProps.status) {
-      this.setState({ showMedia: displayMedia !== 'hide_all' && !nextProps.status.get('sensitive') || displayMedia === 'show_all' });
+      this.setState({ showMedia: defaultMediaVisibility(nextProps.status) });
     }
   }