Selectable: Explicitly check event.ctrlKey now that jQuery differenti…

…ates between meta and ctrl. Fixes #7858 - ctrl-click to select multiple elements not working.

(cherry picked from commit 35dd041)

ui/jquery.ui.selectable.js

@@ -103,7 +103,7 @@ $.widget("ui.selectable", $.ui.mouse, {
 		this.selectees.filter('.ui-selected').each(function() {
 			var selectee = $.data(this, "selectable-item");
 			selectee.startselected = true;
-			if (!event.metaKey) {
+			if (!event.metaKey && !event.ctrlKey) {
 				selectee.$element.removeClass('ui-selected');
 				selectee.selected = false;
 				selectee.$element.addClass('ui-unselecting');
@@ -118,7 +118,7 @@ $.widget("ui.selectable", $.ui.mouse, {
 		$(event.target).parents().andSelf().each(function() {
 			var selectee = $.data(this, "selectable-item");
 			if (selectee) {
-				var doSelect = !event.metaKey || !selectee.$element.hasClass('ui-selected');
+				var doSelect = (!event.metaKey && !event.ctrlKey) || !selectee.$element.hasClass('ui-selected');
 				selectee.$element
 					.removeClass(doSelect ? "ui-unselecting" : "ui-selected")
 					.addClass(doSelect ? "ui-selecting" : "ui-unselecting");
@@ -188,7 +188,7 @@ $.widget("ui.selectable", $.ui.mouse, {
 			} else {
 				// UNSELECT
 				if (selectee.selecting) {
-					if (event.metaKey && selectee.startselected) {
+					if ((event.metaKey || event.ctrlKey) && selectee.startselected) {
 						selectee.$element.removeClass('ui-selecting');
 						selectee.selecting = false;
 						selectee.$element.addClass('ui-selected');
@@ -207,7 +207,7 @@ $.widget("ui.selectable", $.ui.mouse, {
 					}
 				}
 				if (selectee.selected) {
-					if (!event.metaKey && !selectee.startselected) {
+					if (!event.metaKey && !event.ctrlKey && !selectee.startselected) {
 						selectee.$element.removeClass('ui-selected');
 						selectee.selected = false;