add test for #61919

src/vs/workbench/services/decorations/test/browser/decorationsService.test.ts

@@ -241,4 +241,80 @@ suite('DecorationsService', function () {
 
 		reg.dispose();
 	});
+
+	test('Folder decorations don\'t go away when file with problems is deleted #61919 (part1)', function () {
+
+		let emitter = new Emitter<URI[]>();
+		let gone = false;
+		let reg = service.registerDecorationsProvider({
+			label: 'Test',
+			onDidChange: emitter.event,
+			provideDecorations(uri: URI) {
+				if (!gone && uri.path.match(/file.ts$/)) {
+					return { tooltip: 'FOO', weight: 17, bubble: true };
+				}
+				return undefined;
+			}
+		});
+
+		let uri = URI.parse('foo:/folder/file.ts');
+		let uri2 = URI.parse('foo:/folder/');
+		let data = service.getDecoration(uri, true);
+		assert.equal(data.tooltip, 'FOO');
+
+		data = service.getDecoration(uri2, true);
+		assert.ok(data.tooltip); // emphazied items...
+
+		gone = true;
+		emitter.fire([uri]);
+
+		data = service.getDecoration(uri, true);
+		assert.equal(data, undefined);
+
+		data = service.getDecoration(uri2, true);
+		assert.equal(data, undefined);
+
+		reg.dispose();
+	});
+
+	test('Folder decorations don\'t go away when file with problems is deleted #61919 (part2)', function () {
+
+		let emitter = new Emitter<URI[]>();
+		let gone = false;
+		let reg = service.registerDecorationsProvider({
+			label: 'Test',
+			onDidChange: emitter.event,
+			provideDecorations(uri: URI) {
+				if (!gone && uri.path.match(/file.ts$/)) {
+					return { tooltip: 'FOO', weight: 17, bubble: true };
+				}
+				return undefined;
+			}
+		});
+
+		let uri = URI.parse('foo:/folder/file.ts');
+		let uri2 = URI.parse('foo:/folder/');
+		let data = service.getDecoration(uri, true);
+		assert.equal(data.tooltip, 'FOO');
+
+		data = service.getDecoration(uri2, true);
+		assert.ok(data.tooltip); // emphazied items...
+
+		return new Promise((resolve, reject) => {
+			let l = service.onDidChangeDecorations(e => {
+				l.dispose();
+				try {
+					assert.ok(e.affectsResource(uri));
+					assert.ok(e.affectsResource(uri2));
+					resolve();
+					reg.dispose();
+				} catch (err) {
+					reject(err);
+					reg.dispose();
+				}
+			});
+			gone = true;
+			emitter.fire([uri]);
+		});
+	});
 });