Store Uri.toString in backup file content

src/vs/workbench/services/backup/node/backupFileService.ts

@@ -155,7 +155,7 @@ export class BackupFileService implements IBackupFileService {
 			}
 
 			if (resource.scheme === 'file') {
-				content = `${resource.fsPath}\n${content}`;
+				content = `${resource.toString()}\n${content}`;
 			}
 
 			return this.fileService.updateContent(backupResource, content, BACKUP_FILE_UPDATE_OPTIONS).then(() => model.add(backupResource, versionId));

src/vs/workbench/services/backup/test/backupFileService.test.ts

@@ -108,7 +108,7 @@ suite('BackupFileService', () => {
 		service.backupResource(fooFile, 'test').then(() => {
 			assert.equal(fs.readdirSync(path.join(workspaceBackupPath, 'file')).length, 1);
 			assert.equal(fs.existsSync(fooBackupPath), true);
-			assert.equal(fs.readFileSync(fooBackupPath), `${fooFile.fsPath}\ntest`);
+			assert.equal(fs.readFileSync(fooBackupPath), `${fooFile.toString()}\ntest`);
 			done();
 		});
 	});