Fix #12846. Restore overflow when animation is stopped.

(Cherry picked from a6c358d0)

src/effects.js

@@ -303,7 +303,7 @@ function defaultPrefilter( elem, props, opts ) {
 	if ( opts.overflow ) {
 		style.overflow = "hidden";
 		if ( !jQuery.support.shrinkWrapBlocks ) {
-			anim.done(function() {
+			anim.always(function() {
 				style.overflow = opts.overflow[ 0 ];
 				style.overflowX = opts.overflow[ 1 ];
 				style.overflowY = opts.overflow[ 2 ];

test/unit/effects.js

@@ -1787,16 +1787,18 @@ asyncTest("Animation callbacks (#11797)", 15, function() {
 	});
 });
 
-test( "Animate properly sets overflow hidden when animating width/height (#12117)", 4, function() {
+test( "Animate properly sets overflow hidden when animating width/height (#12117)", 8, function() {
 	jQuery.each( [ "height", "width" ], function( _, prop ) {
 		jQuery.each( [ 100, 0 ], function( _, value ) {
-			var div = jQuery("<div>"),
+			var div = jQuery("<div>").css( "overflow", "auto" ),
 				props = {};
 			props[ prop ] = value;
 			div.animate( props, 1 );
 			equal( div.css( "overflow" ), "hidden",
 				"overflow: hidden set when animating " + prop + " to " + value );
 			div.stop();
+			equal( div.css( "overflow" ), "auto",
+				"overflow: auto restored after animating " + prop + " to " + value );
 		});
 	});
 });