"Go to Next Diff in Pull Request" command error (#6563)

* "Go to Next Diff in Pull Request" command fails with error
Fixes #6237

* Switch to info message

src/commands.ts

@@ -1536,7 +1536,7 @@ ${contents}
 		}
 
 		const editorUri = editor.document.uri;
-		if (input.original.scheme !== Schemes.Review) {
+		if ((input.original.scheme !== Schemes.Review) && (input.original.scheme !== Schemes.Pr)) {
 			return vscode.window.showErrorMessage(vscode.l10n.t('Current file isn\'t a pull request diff.'));
 		}
 
@@ -1559,6 +1559,10 @@ ${contents}
 			}
 		}
 
+		if (input.original.scheme === Schemes.Pr) {
+			return vscode.window.showInformationMessage(vscode.l10n.t('No more diffs in this file. Check out the pull request to use this command across files.'));
+		}
+
 		// There is no new range to reveal, time to go to the next file.
 		const folderManager = reposManager.getManagerForFile(editorUri);
 		if (!folderManager) {