Limit disabled dispatching fix to inserted and removed events

dom/dispatch/dispatch-test.js

@@ -17,19 +17,6 @@ test("basic synthetic events", function () {
 
 });
 
-test("synthetic events on disabled element", function () {
-	expect(1);
-	var input = document.createElement("input");
-	input.disabled = true;
-
-	domEvents.addEventListener.call(input, "foo", function(){
-		ok(true, "called back");
-	});
-
-	document.getElementById("qunit-fixture").appendChild(input);
-	domDispatch.call(input, "foo", [], false);
-});
-
 test("more complex synthetic events", function () {
 	var div = document.createElement("div");
 	var arr = [];

dom/events/events.js

@@ -1,6 +1,13 @@
 var assign = require("../../js/assign/assign");
 var _document = require("../document/document");
+var isPlainObject = require("../../js/is-plain-object/is-plain-object");
+var fixSyntheticEventsOnDisabled = false;
 
+function isDispatchingOnDisabled(element, ev) {
+	var isInsertedOrRemoved = isPlainObject(ev) ? (ev.type === 'inserted' || ev.type === 'removed') : (ev === 'inserted' || ev === 'removed');
+	var isDisabled = !!element.disabled;
+	return isInsertedOrRemoved && isDisabled;
+}
 /**
  * @module {{}} can-util/dom/events/events events
  * @parent can-util/dom
@@ -23,7 +30,7 @@ module.exports = {
 	dispatch: function(event, args, bubbles){
 		var doc = _document();
 		var ret;
-		var dispatchingOnDisabled = this.disabled;
+		var dispatchingOnDisabled = fixSyntheticEventsOnDisabled && isDispatchingOnDisabled(this, event);
 
 		var ev = doc.createEvent('HTMLEvents');
 		var isString = typeof event === "string";
@@ -35,9 +42,6 @@ module.exports = {
 			assign(ev, event);
 		}
 		ev.args = args;
-		// In FireFox, dispatching an event on a disabled element throws an error.
-		// So ensure the mutatedNode is not disabled.
-		// https://bugzilla.mozilla.org/show_bug.cgi?id=329509
 		if(dispatchingOnDisabled) {
 			this.disabled = false;
 		}
@@ -48,3 +52,24 @@ module.exports = {
 		return ret;
 	}
 };
+
+// In FireFox, dispatching a synthetic event on a disabled element throws an error.
+// Other browsers, like IE 10 do not dispatch synthetic events on disabled elements at all.
+// This determines if we have to work around that when dispatching events.
+// https://bugzilla.mozilla.org/show_bug.cgi?id=329509
+(function() {
+	var input = document.createElement("input");
+	input.disabled = true;
+	var timer = setTimeout(function() {
+		fixSyntheticEventsOnDisabled = true;
+	}, 50);
+	module.exports.addEventListener.call(input, 'foo', function(){
+		clearTimeout(timer);
+	});
+	try {
+		module.exports.dispatch.call(input, 'foo', [], false);
+	} catch(e) {
+		clearTimeout(timer);
+		fixSyntheticEventsOnDisabled = true;
+	}
+})();

dom/events/inserted/inserted-test.js

@@ -39,9 +39,10 @@ function runTest(name, MUT_OBS) {
 		});
 
 		// With no mutation observer this test will not pass without a setTimeout
+		// There is a setTimeout, 0 in the non-mutation observer code path
 		setTimeout(function(){
 			domMutate.appendChild.call(document.getElementById("qunit-fixture"), input);
-		}, 20);
+		}, 50);
 	});
 	asyncTest("parent then child inserted - appendChild", function () {
 		expect(1);