Sortable: Redetermine floating flag when recalculating positions

This addresses a bug where users initialize empty sortable lists are
add items dynamically. In this situation refresh() should recognize the
position and orientation of the new items.

Fixes #7498
Closes gh-1381
(cherry picked from commit f656aebe3f99356b7eb91ffdafe6689ecc8fb4ae)

1 files changed, 35 insertions, 0 deletions

diff --git a/tests/unit/sortable/sortable_methods.js b/tests/unit/sortable/sortable_methods.js
index f3fe240e7..9c0a86a35 100644
--- a/tests/unit/sortable/sortable_methods.js
+++ b/tests/unit/sortable/sortable_methods.js
@@ -90,4 +90,39 @@ test( "disable", function() {
 	equal( chainable, element, "disable is chainable" );
 });
 
+test( "refresh() should update the positions of initially empty lists (see #7498)", function() {
+	expect( 1 );
+
+	var changeCount = 0,
+		element = $( "#qunit-fixture" ).html( "<ul></ul>" ).find( "ul" );
+
+	element
+		.css({
+			"float": "left",
+			width: "100px"
+		})
+		.sortable({
+			change: function() {
+				changeCount++;
+			}
+		})
+		.append( "<li>a</li><li>a</li>" )
+		.find( "li" )
+			.css({
+				"float": "left",
+				width: "50px",
+				height: "50px"
+			});
+
+	element.sortable( "refresh" );
+
+	// Switch the order of the two li elements
+	element.find( "li" ).eq( 0 ).simulate( "drag", {
+		dx: 55,
+		moves: 15
+	});
+
+	equal( changeCount, 1 );
+});
+
 })(jQuery);