Effects: Respect display value on inline elements

Take "olddisplay" value into the account

Fixes #14824
Closes gh-1566
Ref 73fe1729

src/effects.js

@@ -116,7 +116,7 @@ function createTween( value, prop, animation ) {
 
 function defaultPrefilter( elem, props, opts ) {
 	/* jshint validthis: true */
-	var prop, value, toggle, tween, hooks, oldfire, display,
+	var prop, value, toggle, tween, hooks, oldfire, display, checkDisplay,
 		anim = this,
 		orig = {},
 		style = elem.style,
@@ -160,10 +160,12 @@ function defaultPrefilter( elem, props, opts ) {
 		// Set display property to inline-block for height/width
 		// animations on inline elements that are having width/height animated
 		display = jQuery.css( elem, "display" );
+
 		// Test default display if display is currently "none"
-		if ( (display === "none" ? defaultDisplay( elem.nodeName ) : display) === "inline" &&
-				jQuery.css( elem, "float" ) === "none" ) {
+		checkDisplay = display === "none" ?
+			data_priv.get( elem, "olddisplay" ) || defaultDisplay( elem.nodeName ) : display;
 
+		if ( checkDisplay === "inline" && jQuery.css( elem, "float" ) === "none" ) {
 			style.display = "inline-block";
 		}
 	}

test/data/testsuite.css

@@ -138,4 +138,7 @@ section { background:#f0f; display:block; }
 /* #11971 */
 #foo { background: url(1x1.jpg) right bottom no-repeat; }
 
+/* #14824 */
+#span-14824 { display: block; }
+
 #display { display: list-item !important; }

test/unit/effects.js

@@ -2158,4 +2158,28 @@ test( "slideDown() after stop() (#13483)", 2, function() {
 		clock.tick( 10 );
 });
 
+test( "Respect display value on inline elements (#14824)", 2, function() {
+	var clock = this.clock,
+		fromStyleSheet = jQuery( "<span id='span-14824' />" ),
+		fromStyleAttr = jQuery( "<span style='display: block;' />" );
+
+	jQuery( "#qunit-fixture" ).append( fromStyleSheet, fromStyleAttr );
+
+	fromStyleSheet.slideUp(function() {
+		jQuery( this ).slideDown( function() {
+			equal( jQuery( this ).css( "display" ), "block",
+				"Respect previous display value (from stylesheet) on span element" );
+		});
+	});
+
+	fromStyleAttr.slideUp( function() {
+		jQuery( this ).slideDown( function() {
+			equal( jQuery( this ).css( "display" ), "block",
+				"Respect previous display value (from style attribute) on span element" );
+		});
+	});
+
+	clock.tick( 800 );
+});
+
 })();