Replaced the obsolete toggle event handling JS function

The toggle(func1, func2) event handling function has been removed
in jQuery 1.9.

django/contrib/admin/static/admin/js/collapse.js

@@ -10,15 +10,15 @@
 			}
 		});
 		// Add toggle to anchor tag
-		$("fieldset.collapse a.collapse-toggle").toggle(
-			function() { // Show
+		$("fieldset.collapse a.collapse-toggle").click(function(ev) {
+			if ($(this).closest("fieldset").hasClass("collapsed")) {
+				// Show
 				$(this).text(gettext("Hide")).closest("fieldset").removeClass("collapsed").trigger("show.fieldset", [$(this).attr("id")]);
-				return false;
-			},
-			function() { // Hide
+			} else {
+				// Hide
 				$(this).text(gettext("Show")).closest("fieldset").addClass("collapsed").trigger("hide.fieldset", [$(this).attr("id")]);
-				return false;
 			}
-		);
+			return false;
+		});
 	});
 })(django.jQuery);

django/contrib/admin/static/admin/js/collapse.min.js

-(function(a){a(document).ready(function(){a("fieldset.collapse").each(function(c,b){a(b).find("div.errors").length==0&&a(b).addClass("collapsed").find("h2").first().append(' (<a id="fieldsetcollapser'+c+'" class="collapse-toggle" href="#">'+gettext("Show")+"</a>)")});a("fieldset.collapse a.collapse-toggle").toggle(function(){a(this).text(gettext("Hide")).closest("fieldset").removeClass("collapsed").trigger("show.fieldset",[a(this).attr("id")]);return false},function(){a(this).text(gettext("Show")).closest("fieldset").addClass("collapsed").trigger("hide.fieldset",
-[a(this).attr("id")]);return false})})})(django.jQuery);
+(function(a){a(document).ready(function(){a("fieldset.collapse").each(function(c,b){0==a(b).find("div.errors").length&&a(b).addClass("collapsed").find("h2").first().append(' (<a id="fieldsetcollapser'+c+'" class="collapse-toggle" href="#">'+gettext("Show")+"</a>)")});a("fieldset.collapse a.collapse-toggle").click(function(){a(this).closest("fieldset").hasClass("collapsed")?a(this).text(gettext("Hide")).closest("fieldset").removeClass("collapsed").trigger("show.fieldset",[a(this).attr("id")]):a(this).text(gettext("Show")).closest("fieldset").addClass("collapsed").trigger("hide.fieldset",
+[a(this).attr("id")]);return!1})})})(django.jQuery);