fix(cli): stack glob patterns only select one stack (#15071)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

packages/aws-cdk/lib/api/cxapp/cloud-assembly.ts

@@ -3,6 +3,7 @@ import * as colors from 'colors/safe';
 import * as minimatch from 'minimatch';
 import * as semver from 'semver';
 import { error, print, warning } from '../../logging';
+import { flatten } from '../../util';
 import { versionNumber } from '../../version';
 
 export enum DefaultSelection {
@@ -135,9 +136,7 @@ export class CloudAssembly {
       return false;
     };
 
-    const matchedStacks = patterns
-      .map(pattern => stacks.find(matchingPattern(pattern)))
-      .filter(s => s != null) as cxapi.CloudFormationStackArtifact[];
+    const matchedStacks = flatten(patterns.map(pattern => stacks.filter(matchingPattern(pattern))));
 
     return this.extendStacks(matchedStacks, stacks, extend);
   }

packages/aws-cdk/test/api/cloud-assembly.test.ts

@@ -42,6 +42,19 @@ test('select all top level stacks in the presence of nested assemblies', async (
   expect(x.stackIds).toContain('withouterrors');
 });
 
+test('select stacks by glob pattern', async () => {
+  // GIVEN
+  const cxasm = await testCloudAssembly();
+
+  // WHEN
+  const x = await cxasm.selectStacks({ patterns: ['with*'] }, { defaultBehavior: DefaultSelection.AllStacks });
+
+  // THEN
+  expect(x.stackCount).toBe(2);
+  expect(x.stackIds).toContain('witherrors');
+  expect(x.stackIds).toContain('withouterrors');
+});
+
 test('select behavior: all', async () => {
   // GIVEN
   const cxasm = await testCloudAssembly();