fix: focus restoration issue in IE

Author: crisbeto

src/lib/sidenav/sidenav.scss

@@ -84,7 +84,6 @@
   height: 100%;
   overflow-y: auto; // TODO(kara): revisit scrolling behavior for sidenavs
   transform: translate3d(-100%, 0, 0);
-  visibility: hidden;
 
   &.mat-sidenav-side {
     z-index: 1;

src/lib/sidenav/sidenav.ts

@@ -56,6 +56,9 @@ export function throwMdDuplicatedSidenavError(align: string) {
         transform: 'translate3d(0, 0, 0)',
         visibility: 'visible',
       })),
+      state('void', style({
+        visibility: 'hidden',
+      })),
       transition('* => *', animate('400ms cubic-bezier(0.25, 0.8, 0.25, 1)'))
     ])
   ],