no great way to review changes following comment (#7215)

Fixes #7182

Author: alexr00

src/github/pullRequestOverview.ts

@@ -377,7 +377,7 @@ export class PullRequestOverviewPanel extends IssueOverviewPanel<PullRequestMode
 			case 'pr.update-branch':
 				return this.updateBranch(message);
 			case 'pr.gotoChangesSinceReview':
-				return this.gotoChangesSinceReview();
+				return this.gotoChangesSinceReview(message);
 			case 'pr.re-request-review':
 				return this.reRequestReview(message);
 			case 'pr.revert':
@@ -389,8 +389,9 @@ export class PullRequestOverviewPanel extends IssueOverviewPanel<PullRequestMode
 		}
 	}
 
-	private gotoChangesSinceReview() {
+	private gotoChangesSinceReview(message: IRequestMessage<void>): Promise<void> {
 		this._item.showChangesSinceReview = true;
+		return this._replyMessage(message, {});
 	}
 
 	private async changeReviewers(message: IRequestMessage<void>): Promise<void> {

src/view/reviewManager.ts

@@ -534,6 +534,9 @@ export class ReviewManager extends Disposable {
 				this.changesInPrDataProvider.refresh();
 				await this.updateComments();
 				await this.reopenNewReviewDiffs();
+				if (pr) {
+					PullRequestModel.openChanges(this._folderRepoManager, pr);
+				}
 				this._changesSinceLastReviewProgress.endProgress();
 			})
 		);

webviews/components/timeline.tsx

@@ -129,7 +129,18 @@ const CommitEventView = (event: CommitEvent) => (
 );
 
 const NewCommitsSinceReviewEventView = () => {
-	const { gotoChangesSinceReview } = useContext(PullRequestContext);
+	const { gotoChangesSinceReview, pr } = useContext(PullRequestContext);
+	if (!pr.isCurrentlyCheckedOut) {
+		return null;
+	}
+
+	const [busy, setBusy] = useState(false);
+	const viewChanges = async () => {
+		setBusy(true);
+		await gotoChangesSinceReview();
+		setBusy(false);
+	};
+
 	return (
 		<div className="comment-container commit">
 			<div className="commit-message">
@@ -140,7 +151,8 @@ const NewCommitsSinceReviewEventView = () => {
 			<button
 				aria-live="polite"
 				title="View the changes since your last review"
-				onClick={() => gotoChangesSinceReview()}
+				onClick={viewChanges}
+				disabled={busy}
 			>
 				View Changes
 			</button>