Resizable: margin:auto bug in FF, Opera, IE

[raavo]

SUBJECT: Centered element with auto margins.

PROBLEM: Broken left/top position while being resized.

RESULT: Resizable element appears to be jumpy.

CAUSE: This is caused by bugfix no 1749 and it's incompatibility with auto margins.

AFFECTED BROWSERS: FF, Opera, IE

EXAMPLE: ​http://editor.24hravi.net/bug.htm

<div  style="position:absolute;left:1px;right:1px;margin:auto;width:50%;height:50%"></div>

Initial margin-left from style: auto;

Initial left position from style: 1px;

Computed margin-left from browser: 0px;

Computed left position from browser: 1px+25%;

RESIZABLE 1.8.6:

	_mouseStart: function(event) {

		var o = this.options, iniPos = this.element.position(), el = this.element;

		this.resizing = true;
		this.documentScroll = { top: $(document).scrollTop(), left: $(document).scrollLeft() };

		// bugfix for http://dev.jquery.com/ticket/1749
		if (el.is('.ui-draggable') || (/absolute/).test(el.css('position'))) {
			el.css({ position: 'absolute', top: iniPos.top, left: iniPos.left });
		}

SUGGESTED FIX:

	_mouseStart: function(event) {

		var o = this.options, el = this.element;

		this.resizing = true;
		this.documentScroll = { top: $(document).scrollTop(), left: $(document).scrollLeft() };

		// bugfix for http://dev.jquery.com/ticket/1749
		if (el.is('.ui-draggable') || (/absolute/).test(el.css('position'))) {
			el.css({ position: 'absolute', top: el.css('top'), left: el.css('left') });
		}

ADDITIONAL: Browser info about "auto" margins: ​http://www.3d3r.com/simon/marginAutoComputedValue/

[raavo]

Cannot find where I can edit this ticket. Wanted to edit the fix :) Guess I'll have to leave it to you guys.

[raavo]

PROBLEM EXAMPLE IN JSFIDDLE: ​http://jsfiddle.net/JwtFb/