Index: branches/5.2.x/core/admin_templates/js/forms.js
===================================================================
diff -u -N -r16647 -r16773
--- branches/5.2.x/core/admin_templates/js/forms.js	(.../forms.js)	(revision 16647)
+++ branches/5.2.x/core/admin_templates/js/forms.js	(.../forms.js)	(revision 16773)
@@ -148,6 +148,8 @@
 Form.ScrollerH = 17;
 Form.HasChanged = false;
 
+Form.reizeTimeoutId = false;
+
 Form.Init = function(id) {
 	this.Div = document.getElementById(id);
 	if (!this.Div) {
@@ -191,7 +193,13 @@
 
 //	alert('Measuring min width now')
 
-	addEvent(window, 'resize', function() {Form.Resize()})
+	// Call the "resize" event using debounce technique.
+	$(window).resize(function () {
+		clearTimeout(Form.reizeTimeoutId);
+		Form.reizeTimeoutId = setTimeout(function () {
+			Form.Resize();
+		}, 100);
+	});
 
 	this.Resize(false);
 
@@ -283,7 +291,7 @@
 	var h = (document.all ? window.document.body.offsetHeight : window.innerHeight);
 
 	var $div = $(this.Div);
-	var pos = $div.offset();
+	var pos = this.GetOffsetWithoutUserScroll($div);
 
 	h -= pos.top;
 
@@ -362,6 +370,20 @@
 //	print_pre(this.Controls)
 };
 
+Form.GetOffsetWithoutUserScroll = function ($div) {
+	var $ret,
+		$wrapper_div = $div.parent(),
+		$old_scroll_top = $wrapper_div.scrollTop();
+
+	$wrapper_div.scrollTop(0);
+
+	$ret = $div.offset();
+
+	$wrapper_div.scrollTop($old_scroll_top);
+
+	return $ret;
+};
+
 Form.ResetHeights = function()
 {
 	for (var i = 0; i < this.Controls.length; i++) {