Spinner: Ignore delta of 0 from triggered mousewheel event. Verified

that mousewheel scrolling actually works fine in IE6.

Author: jzaefferer

tests/unit/spinner/spinner_core.js

@@ -120,14 +120,15 @@ test("mouse click on buttons", function() {
 });
 
 test("mouse wheel on input", function() {
-	expect(3);
+	expect(4);
+	stop();
 
 	var el = $("#spin").spinner();
+	equal(el.val(), 0);
 	el.trigger("mousewheel", 1);
 	equal(el.val(), 1);
 
 	// mousewheel handler uses a timeout, need to accomodate that
-	stop();
 	setTimeout(function() {
 		el.trigger("mousewheel", -1);
 		equal(el.val(), 0);

ui/jquery.ui.spinner.js

@@ -181,12 +181,13 @@ $.widget('ui.spinner', {
 		}
 		var self = this;
 		this.element.bind("mousewheel.spinner", function(event, delta) {
-			if (self.options.disabled) {
+			if (self.options.disabled || !delta) {
 				return;
 			}
 			if (!self.spinning && !self._start(event)) {
 				return false;
 			}
+			$("<div>").text("delta: " + delta).appendTo(document.body)
 			self._spin((delta > 0 ? 1 : -1) * self.options.step, event);
 			clearTimeout(self.timeout);
 			self.timeout = setTimeout(function() {