use -z --stdin when running check-ignore, qualified guess for #37857

extensions/git/src/repository.ts

@@ -722,15 +722,17 @@ export class Repository implements Disposable {
 					return resolve(new Set<string>());
 				}
 
-				const child = this.repository.stream(['check-ignore', ...filePaths]);
+				// https://git-scm.com/docs/git-check-ignore#git-check-ignore--z
+				const child = this.repository.stream(['check-ignore', '-z', '--stdin'], { stdio: [null, null, null] });
+				child.stdin.end(filePaths.join('\0'), 'utf8');
 
 				const onExit = exitCode => {
 					if (exitCode === 1) {
 						// nothing ignored
 						resolve(new Set<string>());
 					} else if (exitCode === 0) {
-						// each line is something ignored
-						resolve(new Set<string>(data.split('\n')));
+						// paths are separated by the null-character
+						resolve(new Set<string>(data.split('\0')));
 					} else {
 						reject(new GitError({ stdout: data, stderr, exitCode }));
 					}