fix(cdk/overlay): not emitting for auxiliary button clicks

src/cdk/overlay/dispatchers/overlay-outside-click-dispatcher.spec.ts

@@ -1,6 +1,6 @@
 import {TestBed, inject, fakeAsync} from '@angular/core/testing';
 import {Component, NgModule} from '@angular/core';
-import {dispatchMouseEvent} from '@angular/cdk/testing/private';
+import {dispatchFakeEvent, dispatchMouseEvent} from '@angular/cdk/testing/private';
 import {OverlayModule, OverlayContainer, Overlay} from '../index';
 import {OverlayOutsideClickDispatcher} from './overlay-outside-click-dispatcher';
 import {ComponentPortal} from '@angular/cdk/portal';
@@ -51,9 +51,7 @@ describe('OverlayOutsideClickDispatcher', () => {
     overlayTwo.dispose();
   });
 
-  it(
-    'should dispatch mouse click events to the attached overlays',
-    () => {
+  it('should dispatch mouse click events to the attached overlays', () => {
     const overlayOne = overlay.create();
     overlayOne.attach(new ComponentPortal(TestComponent));
     const overlayTwo = overlay.create();
@@ -80,27 +78,53 @@ describe('OverlayOutsideClickDispatcher', () => {
     overlayTwo.dispose();
   });
 
-  it(
-    'should dispatch mouse click events to the attached overlays even when propagation is stopped',
-    () => {
-    const overlayRef = overlay.create();
-    overlayRef.attach(new ComponentPortal(TestComponent));
-    const spy = jasmine.createSpy('overlay mouse click event spy');
-    overlayRef.outsidePointerEvents().subscribe(spy);
+  it('should dispatch auxiliary button click events to the attached overlays', () => {
+    const overlayOne = overlay.create();
+    overlayOne.attach(new ComponentPortal(TestComponent));
+    const overlayTwo = overlay.create();
+    overlayTwo.attach(new ComponentPortal(TestComponent));
 
-    outsideClickDispatcher.add(overlayRef);
+    const overlayOneSpy = jasmine.createSpy('overlayOne auxiliary click event spy');
+    const overlayTwoSpy = jasmine.createSpy('overlayTwo auxiliary click event spy');
+
+    overlayOne.outsidePointerEvents().subscribe(overlayOneSpy);
+    overlayTwo.outsidePointerEvents().subscribe(overlayTwoSpy);
+
+    outsideClickDispatcher.add(overlayOne);
+    outsideClickDispatcher.add(overlayTwo);
 
     const button = document.createElement('button');
     document.body.appendChild(button);
-    button.addEventListener('click', event => event.stopPropagation());
-    button.click();
+    dispatchFakeEvent(button, 'auxclick');
 
-    expect(spy).toHaveBeenCalled();
+    expect(overlayOneSpy).toHaveBeenCalled();
+    expect(overlayTwoSpy).toHaveBeenCalled();
 
     button.parentNode!.removeChild(button);
-    overlayRef.dispose();
+    overlayOne.dispose();
+    overlayTwo.dispose();
   });
 
+  it('should dispatch mouse click events to the attached overlays even when propagation is stopped',
+    () => {
+      const overlayRef = overlay.create();
+      overlayRef.attach(new ComponentPortal(TestComponent));
+      const spy = jasmine.createSpy('overlay mouse click event spy');
+      overlayRef.outsidePointerEvents().subscribe(spy);
+
+      outsideClickDispatcher.add(overlayRef);
+
+      const button = document.createElement('button');
+      document.body.appendChild(button);
+      button.addEventListener('click', event => event.stopPropagation());
+      button.click();
+
+      expect(spy).toHaveBeenCalled();
+
+      button.parentNode!.removeChild(button);
+      overlayRef.dispose();
+    });
+
   it('should dispose of the global click event handler correctly', () => {
     const overlayRef = overlay.create();
     const body = document.body;
@@ -191,10 +215,8 @@ describe('OverlayOutsideClickDispatcher', () => {
     overlayRef.dispose();
   });
 
-  it(
-    'should not throw an error when when closing out related components via the' +
-      ' outsidePointerEvents emitter on background click',
-    fakeAsync(() => {
+  it('should not throw an error when when closing out related components via the ' +
+    'outsidePointerEvents emitter on background click', fakeAsync(() => {
       const firstOverlayRef = overlay.create();
       firstOverlayRef.attach(new ComponentPortal(TestComponent));
       const secondOverlayRef = overlay.create();

src/cdk/overlay/dispatchers/overlay-outside-click-dispatcher.ts

@@ -30,23 +30,23 @@ export class OverlayOutsideClickDispatcher extends BaseOverlayDispatcher {
   add(overlayRef: OverlayReference): void {
     super.add(overlayRef);
 
-    // tslint:disable: max-line-length
     // Safari on iOS does not generate click events for non-interactive
     // elements. However, we want to receive a click for any element outside
     // the overlay. We can force a "clickable" state by setting
-    // `cursor: pointer` on the document body.
-    // See https://developer.mozilla.org/en-US/docs/Web/API/Element/click_event#Safari_Mobile
-    // and https://developer.apple.com/library/archive/documentation/AppleApplications/Reference/SafariWebContent/HandlingEvents/HandlingEvents.html
-    // tslint:enable: max-line-length
+    // `cursor: pointer` on the document body. See:
+    // https://developer.mozilla.org/en-US/docs/Web/API/Element/click_event#Safari_Mobile
+    // https://developer.apple.com/library/archive/documentation/AppleApplications/Reference/SafariWebContent/HandlingEvents/HandlingEvents.html
     if (!this._isAttached) {
-      this._document.body.addEventListener('click', this._clickListener, true);
-      this._document.body.addEventListener('contextmenu', this._clickListener, true);
+      const body = this._document.body;
+      body.addEventListener('click', this._clickListener, true);
+      body.addEventListener('auxclick', this._clickListener, true);
+      body.addEventListener('contextmenu', this._clickListener, true);
 
       // click event is not fired on iOS. To make element "clickable" we are
       // setting the cursor to pointer
       if (this._platform.IOS && !this._cursorStyleIsSet) {
-        this._cursorOriginalValue = this._document.body.style.cursor;
-        this._document.body.style.cursor = 'pointer';
+        this._cursorOriginalValue = body.style.cursor;
+        body.style.cursor = 'pointer';
         this._cursorStyleIsSet = true;
       }
 
@@ -57,10 +57,12 @@ export class OverlayOutsideClickDispatcher extends BaseOverlayDispatcher {
   /** Detaches the global keyboard event listener. */
   protected detach() {
     if (this._isAttached) {
-      this._document.body.removeEventListener('click', this._clickListener, true);
-      this._document.body.removeEventListener('contextmenu', this._clickListener, true);
+      const body = this._document.body;
+      body.removeEventListener('click', this._clickListener, true);
+      body.removeEventListener('auxclick', this._clickListener, true);
+      body.removeEventListener('contextmenu', this._clickListener, true);
       if (this._platform.IOS && this._cursorStyleIsSet) {
-        this._document.body.style.cursor = this._cursorOriginalValue;
+        body.style.cursor = this._cursorOriginalValue;
         this._cursorStyleIsSet = false;
       }
       this._isAttached = false;