Resizable helper is added to this.options.modifyThese on every drag-start.

I just realized that the resize-helper is added to the this.options.modifyThese array on every drag-start. I think from the performance point of view that's not good since the drag-function loops through this array and re-sets css-properties on drag. I see no use of setting the css property of the helper multiple times... Furthermore performance decreases with every additional resize...

My solution is to replace

		this.options.modifyThese.push([$(this.helper),0,0]);

with

			if ( this.options.modifyThese.length == 0 || !this.options.modifyThese[this.options.modifyThese.length-1][0].is('.ui-resizable') ) {
				this.options.modifyThese.push([$(this.helper),0,0]);
			}

in ui.resizables.js in the start-method.