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Fix error about MessagePanel not being available for read markers 

Stacktrace:
```
TimelinePanel.js?b9ae:1139 Uncaught (in promise) TypeError: Cannot read property 'getBoundingClientRect' of null
    at Object._getLastDisplayedEventIndex (TimelinePanel.js?b9ae:1139)
    at Object.updateReadMarker (TimelinePanel.js?b9ae:751)
    at Object._callee$ (TimelinePanel.js?b9ae:613)
    at tryCatch (runtime.js?4422:45)
    at Generator.invoke [as _invoke] (runtime.js?4422:271)
    at Generator.prototype.<computed> [as next] (runtime.js?4422:97)
    at asyncGeneratorStep (asyncToGenerator.js?56ef:3)
    at _next (asyncToGenerator.js?56ef:25)
```
pull/21833/head
Travis Ralston 2020-01-17 17:07:37 -07:00
parent 5584068c5b
commit df3fe5139d
1 changed files with 3 additions and 1 deletions
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4
src/components/structures/TimelinePanel.js
View File

@ -1136,7 +1136,9 @@ const TimelinePanel = createReactClass({
const messagePanel = this._messagePanel.current;
if (messagePanel === undefined) return null;
const wrapperRect = ReactDOM.findDOMNode(messagePanel).getBoundingClientRect();
const messagePanelNode = ReactDOM.findDOMNode(messagePanel);
if (!messagePanelNode) return null; // sometimes this happens for fresh rooms/post-sync
const wrapperRect = messagePanelNode.getBoundingClientRect();
const myUserId = MatrixClientPeg.get().credentials.userId;
const isNodeInView = (node) => {