Opera TypeError with mousedown used in conjunction with sortables

[ghouston]

I upgraded from r1514 to r1537.

I am getting a TypeError? in both Opera 9.27 and 9.5b now when using mousedown events in conjunction with sortables that I was not getting with r1514. I am using similar code in a sortable dock and with sortable tabs. Both cease to function in Opera with r1537.

The mousedown/up functionality here has a slightly different purpose with my two use cases. With the sortable dock it allows clicking on the sortables item to destroy the item and restore a window. On the sortable tabs, it allows clicking on a tab and injecting the proper content in the content div. If the time between mousedown and mouseup is greater than 275ms seconds then a sortables drag can occur instead of the "click" function.

Simplified example working with r1514:
http://greghoustondesign.com/examples/mootools/bugs/opera-mousedown/index.html

Example broken with r1537:
http://greghoustondesign.com/examples/mootools/bugs/opera-mousedown/index-1537.html

Javascript:

window.addEvent('domready', function() {
		
	this.tabSortables = new Sortables($('test'), {
		opacity: .3,
		constrain: true,
		clone: false,
		revert: false			
	});		
		
	$$('#test li').addEvent('mousedown', function(evt){
		evt.stop();
		this.timeDown = $time();				
	});
			
	$$('#test li').addEvent('mouseup', function(evt){	
		this.timeUp = $time();
		if ((this.timeUp - this.timeDown) < 275){
			alert(this.timeUp);
		}
	});				

});

HTML:

<ul id="test">
	<li><a href="#">Text 01</a></li>
	<li><a href="#">Text 02</a></li>
	<li><a href="#">Text 03</a></li>
	<li><a href="#">Text 04</a></li>
	<li><a href="#">Text 05</a></li>
	<li><a href="#">Text 06</a></li>			
</ul>

Event thread: mousedown
Error:
name: TypeError?
message: Statement on line 94: Could not convert undefined or null to object
Backtrace:

Line 94 of linked script http://greghoustondesign.com/examples/mootools/bugs/opera-mousedown/scripts/mootools-trunk-1537.js

return arguments.callee.caller._parent_.apply(this, arguments);

Line 377 of linked script http://greghoustondesign.com/examples/mootools/bugs/opera-mousedown/scripts/mootools-trunk-1537.js

this.parent(C, B);

this.droppables = $$(this.options.droppables);

Line 90 of linked script http://greghoustondesign.com/examples/mootools/bugs/opera-mousedown/scripts/mootools-trunk-1537.js

for (F in Class.Mutators)
this.constructor = A;

if (E === $empty)

var C = this.initialize ? this.initialize.apply(this, arguments) : this;

Line 419 of linked script http://greghoustondesign.com/examples/mootools/bugs/opera-mousedown/scripts/mootools-trunk-1537.js

this.drag = new Drag.Move(this.clone, {snap : this.options.snap, container : this.options.constrain && this.element.getParent(), droppables : this.getDroppables(), onSnap : (function ()

{

B.stop();
this.clone.setStyle("visibility", "visible");

this.element.set("opacity", this.options.opacity 0);
this.fireEvent("onStart", [this.element, this.clone]);

}
).bind(this), onEnter : this.insert.bind(this), onCancel : this.reset.bind(this), onComplete : this.end.bind(this)});

Line 56 of linked script http://greghoustondesign.com/examples/mootools/bugs/opera-mousedown/scripts/mootools-trunk-1537.js

return A.apply(B.bind null, C);

Line 57 of linked script http://greghoustondesign.com/examples/mootools/bugs/opera-mousedown/scripts/mootools-trunk-1537.js

return E();

Line 166 of linked script http://greghoustondesign.com/examples/mootools/bugs/opera-mousedown/scripts/mootools-trunk-1537.js

J = new Event(J, I.getWindow());

if (C.call(I, J) === false)

At unknown location

[statement source code not available]

[ghouston]

This may be a duplicate of #974