Fixes #386, Element.position not working correctly when window is scr…

…olled

https://mootools.lighthouseapp.com/projects/24057/tickets/386

- Adds test from ticket for hugely offset document
- Reverts change to Element.Position which adds scroll offset again to
  calculated position

Source/Element/Element.Position.js

@@ -195,13 +195,10 @@ Element.implement({
 			pos.top+= winScroll.y;
 			pos.left+= winScroll.x;
 		}
-		var relScroll = rel.getScroll();
 		if (options.ignoreScroll){
+			var relScroll = rel.getScroll();
 			pos.top -= relScroll.y;
 			pos.left -= relScroll.x;
-		} else {
-			pos.top += relScroll.y;
-			pos.left += relScroll.x;
 		}
 
 		if (options.ignoreMargins){

Tests/Element/Element.Position_(scrolled).html

@@ -0,0 +1,47 @@
+<style>
+	div.container {
+		height: 800px;
+	}
+	#element {
+		width: 100px;
+		height: 100px;
+		background: black;
+		line-height: 30px;
+		text-align: center;
+		font-size: 16px;
+		color: white;
+	}
+	.padding {
+		height: 600px;
+	}
+</style>
+
+<div class="container">
+
+	<p>
+		The black box should always go to center when clicking each of the
+		three buttons -- important to test this relative to scrollPosition.
+		Scroll down for the other buttons.
+	</p>
+
+	<div id="element">Companion square</div>
+
+	<input type="button" value="Click here to position the element centered (1/3)" />
+
+	<div class="padding"></div>
+
+	<input type="button" value="Click here to position the element centered (2/3)" />
+
+	<div class="padding"></div>
+
+	<input type="button" value="Click here to position the element centered (3/3)" />
+
+</div>
+
+<script src="/depender/build?require=More/Element.Position,Core/Element.Event"></script>
+
+<script type="text/javascript">
+	$$('input').addEvent('click', function(){
+		document.id('element').position();
+	});
+</script>