Fix #13483. Let slideDown() work after stop(). Close gh-1205.

AUTHORS.txt

@@ -166,3 +166,4 @@ Dmitry Gusev <dmitry.gusev@gmail.com>
 Michał Gołębiowski <m.goleb@gmail.com>
 Steven Benner <admin@stevenbenner.com>
 Li Xudong <istonelee@gmail.com>
+Renato Oliveira dos Santos <ros3@cin.ufpe.br>

src/effects.js

@@ -304,21 +304,29 @@ function defaultPrefilter( elem, props, opts ) {
 
 
 	// show/hide pass
+	dataShow = jQuery._data( elem, "fxshow" ) || jQuery._data( elem, "fxshow", {} );
 	for ( index in props ) {
 		value = props[ index ];
 		if ( rfxtypes.exec( value ) ) {
 			delete props[ index ];
 			toggle = toggle || value === "toggle";
 			if ( value === ( hidden ? "hide" : "show" ) ) {
+
+				// If there is dataShow left over from a stopped hide or show and we are going to proceed with show, we should pretend to be hidden
+				if( value === "show" && dataShow[ index ] !== undefined ) {
+					hidden = true;
+				} else {
 				continue;
 			}
+			}
 			handled.push( index );
 		}
 	}
 
 	length = handled.length;
-	if ( length ) {
+	if ( !length ) {
 		dataShow = data_priv.get( elem, "fxshow" ) || data_priv.access( elem, "fxshow", {} );
+	} else {
 		if ( "hidden" in dataShow ) {
 			hidden = dataShow.hidden;
 		}

test/unit/effects.js

@@ -2033,4 +2033,64 @@ test( ".finish() calls finish of custom queue functions", function() {
 	div.remove();
 });
 
+asyncTest( "slideDown() after stop() (#13483)", 2, function() {
+	var ul = jQuery( "<ul style='height: 100px;display: block'></ul>" ),
+		origHeight = ul.height();
+
+	// First test. slideUp() -> stop() in the middle -> slideDown() until the end
+	ul.slideUp( 1000 );
+	setTimeout( function() {
+		ul.stop( true );
+		ul.slideDown( 1, function() {
+			equal( ul.height(), origHeight, "slideDown() after interrupting slideUp() with stop(). Height must be in original value" );
+
+			// Second test. slideDown() -> stop() in the middle -> slideDown() until the end
+			ul.slideUp( 1, function() {
+				ul.slideDown( 1000 );
+				setTimeout( function() {
+					ul.stop( true );
+					ul.slideDown( 1, function() {
+						equal( ul.height(), origHeight, "slideDown() after interrupting slideDown() with stop(). Height must be in original value" );
+
+						// Cleanup
+						ul.remove();
+						start();
+					});
+				}, 500 );
+			});
+
+		});
+	}, 500 );
+});
+
+asyncTest( "fadeIn() after stop() (related to #13483)", 2, function() {
+	var ul = jQuery( "<ul style='height: 100px;display: block; opacity: 1'></ul>" ),
+		origOpacity = ul.css( "opacity" );
+
+	// First test. fadeOut() -> stop() in the middle -> fadeIn() until the end
+	ul.fadeOut( 1000 );
+	setTimeout( function() {
+		ul.stop( true );
+		ul.fadeIn( 1, function() {
+			equal( ul.css( "opacity" ), origOpacity, "fadeIn() after interrupting fadeOut() with stop(). Opacity must be in original value" );
+
+			// Second test. fadeIn() -> stop() in the middle -> fadeIn() until the end
+			ul.fadeOut( 1, function() {
+				ul.fadeIn( 1000 );
+				setTimeout( function() {
+					ul.stop( true );
+					ul.fadeIn( 1, function() {
+						equal( ul.css("opacity"), origOpacity, "fadeIn() after interrupting fadeIn() with stop(). Opacity must be in original value" );
+
+						// Cleanup
+						ul.remove();
+						start();
+					});
+				}, 500 );
+			});
+
+		});
+	}, 500 );
+});
+
 })();