fix(material/sidenav): fix view already destroyed error

Author: mmalerba

src/material/autocomplete/autocomplete.spec.ts

@@ -2546,6 +2546,8 @@ describe('MDC-based MatAutocomplete', () => {
         fixture.detectChanges();
         await new Promise(r => setTimeout(r));
         fixture.detectChanges();
+        await new Promise(r => setTimeout(r));
+        fixture.detectChanges();
       };
 
       await flushPosition();

src/material/sidenav/drawer.ts

@@ -333,7 +333,7 @@ export class MatDrawer implements AfterViewInit, AfterContentChecked, OnDestroy
     @Optional() @Inject(DOCUMENT) private _doc: any,
     @Optional() @Inject(MAT_DRAWER_CONTAINER) public _container?: MatDrawerContainer,
   ) {
-    this.openedChange.subscribe((opened: boolean) => {
+    this.openedChange.pipe(takeUntil(this._destroyed)).subscribe((opened: boolean) => {
       if (opened) {
         if (this._doc) {
           this._elementFocusedBeforeDrawerWasOpened = this._doc.activeElement as HTMLElement;