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From a20f8116a5a1e285d79bd5edf40001003ca8f98e Mon Sep 17 00:00:00 2001
From: Jeremy Mickelson <Jeremy.Mickelson@gmail.com>
Date: Thu, 13 Oct 2016 11:48:19 -0600
Subject: [PATCH] Save the z-index before we save the opacity to make sure we
 get the right value

---
 ui/widgets/sortable.js | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/ui/widgets/sortable.js b/ui/widgets/sortable.js
index a953501512c..fcb33ace145 100644
--- a/ui/widgets/sortable.js
+++ b/ui/widgets/sortable.js
@@ -279,13 +279,9 @@ return $.widget( "ui.sortable", $.ui.mouse, {
 				$( "<style>
*{ cursor: " + o.cursor + " !important; }</style>" ).appendTo( body );
 		}
 
-		if ( o.opacity ) { // opacity option
-			if ( this.helper.css( "opacity" ) ) {
-				this._storedOpacity = this.helper.css( "opacity" );
-			}
-			this.helper.css( "opacity", o.opacity );
-		}
-
+		// We need to make sure to grab the zIndex before setting the
+		// opacity, because setting the opacity to anything lower than 1
+		// causes the zIndex to change from "auto" to 0.
 		if ( o.zIndex ) { // zIndex option
 			if ( this.helper.css( "zIndex" ) ) {
 				this._storedZIndex = this.helper.css( "zIndex" );
@@ -293,6 +289,13 @@ return $.widget( "ui.sortable", $.ui.mouse, {
 			this.helper.css( "zIndex", o.zIndex );
 		}
 
+		if ( o.opacity ) { // opacity option
+			if ( this.helper.css( "opacity" ) ) {
+				this._storedOpacity = this.helper.css( "opacity" );
+			}
+			this.helper.css( "opacity", o.opacity );
+		}
+
 		//Prepare scrolling
 		if ( this.scrollParent[ 0 ] !== this.document[ 0 ] &&
 				this.scrollParent[ 0 ].tagName !== "HTML" ) {
