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Refactor TimelinePanel to avoid race conditions in React 18 between state updates (#28416) 

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>
pull/28457/head
Michael Telatynski 2024-11-13 13:39:56 +00:00 committed by GitHub
parent 3132fe3233
commit f77d9b4bcb
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1 changed files with 14 additions and 9 deletions
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23
src/components/structures/TimelinePanel.tsx
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@ -1217,7 +1217,7 @@ class TimelinePanel extends React.Component<IProps, IState> {
return;
}
const lastDisplayedEvent = this.state.events[lastDisplayedIndex];
this.setReadMarker(lastDisplayedEvent.getId()!, lastDisplayedEvent.getTs());
await this.setReadMarker(lastDisplayedEvent.getId()!, lastDisplayedEvent.getTs());
// the read-marker should become invisible, so that if the user scrolls
// down, they don't see it.
@ -1335,7 +1335,7 @@ class TimelinePanel extends React.Component<IProps, IState> {
}
// Update the read marker to the values we found
this.setReadMarker(rmId, rmTs);
await this.setReadMarker(rmId, rmTs);
// Send the receipts to the server immediately (don't wait for activity)
await this.sendReadReceipts();
@ -1866,7 +1866,7 @@ class TimelinePanel extends React.Component<IProps, IState> {
return receiptStore?.getEventReadUpTo(myUserId, ignoreSynthesized) ?? null;
}
private setReadMarker(eventId: string | null, eventTs?: number, inhibitSetState = false): void {
private async setReadMarker(eventId: string | null, eventTs?: number, inhibitSetState = false): Promise<void> {
const roomId = this.props.timelineSet.room?.roomId;
// don't update the state (and cause a re-render) if there is
@ -1890,12 +1890,17 @@ class TimelinePanel extends React.Component<IProps, IState> {
// Do the local echo of the RM
// run the render cycle before calling the callback, so that
// getReadMarkerPosition() returns the right thing.
this.setState(
{
readMarkerEventId: eventId,
},
this.props.onReadMarkerUpdated,
);
await new Promise<void>((resolve) => {
this.setState(
{
readMarkerEventId: eventId,
},
() => {
this.props.onReadMarkerUpdated?.();
resolve();
},
);
});
}
private shouldPaginate(): boolean {