Fix Widgets Helper position on start event - sortable

[alexvorn2]

the widget helper moves (jumpes) to the left, to the parent left position...

in Firefox this is not a bug but in chrome it does.

please take a look in the screenshot, the helper jumped to the left....

​http://wpimpact.com/wp-content/uploads/2012/07/Untitled-2.png

I tried to use the :

ui.helper.css('left', ui.placeholder.position().left)

code but chrome does not set a placeholder position, I don't know why, maybe a chrome bug or in jQuery.

[alexvorn2]

the easiest way to fix it is to create a div parent element to the widgets...

[alexvorn2]

I included a video - ​http://www.screenr.com/zcg7

[alexvorn2]

in 3.8 it's not more a problem

[SergeyBiryukov]

Confirmed the presence of the issue in 3.7 and the absence in 3.8.