CSS: jQuery#hide should always save display value

Fixes #14750
Closes gh-1509
(cherry picked from commit 5a8f7693)

Conflicts:
	src/css.js

src/css.js

@@ -92,13 +92,10 @@ function showHide( elements, show ) {
 				values[ index ] = jQuery._data( elem, "olddisplay", defaultDisplay(elem.nodeName) );
 			}
 		} else {
+			hidden = isHidden( elem );
 
-			if ( !values[ index ] ) {
-				hidden = isHidden( elem );
-
-				if ( display && display !== "none" || !hidden ) {
-					jQuery._data( elem, "olddisplay", hidden ? display : jQuery.css( elem, "display" ) );
-				}
+			if ( display && display !== "none" || !hidden ) {
+				jQuery._data( elem, "olddisplay", hidden ? display : jQuery.css( elem, "display" ) );
 			}
 		}
 	}

test/unit/css.js

@@ -1106,6 +1106,16 @@ asyncTest( "Make sure initialized display value for disconnected nodes is correc
 	jQuery._removeData( jQuery("#display")[ 0 ] );
 });
 
+test( "show() after hide() should always set display to initial value (#14750)", 1, function() {
+	var div = jQuery( "<div />" ),
+		fixture = jQuery( "#qunit-fixture" );
+
+	fixture.append( div );
+
+	div.css( "display", "inline" ).hide().show().css( "display", "list-item" ).hide().show();
+	equal( div.css( "display" ), "list-item", "should get last set display value" );
+});
+
 // Support: IE < 11, Safari < 7
 // We have to jump through the hoops here in order to test work with "order" CSS property,
 // that some browsers do not support. This test is not, strictly speaking, correct,