ducksboard/gridster.js — pull request #246 by AryDvoretz (2013-10-31 09:58:05+00:00)
Title: For the use-case of self re-sizing grid and keeping the dragging abiliti...

...es

Following the idea in the extension here: http://jsfiddle.net/nxmRr/30/

Once the container re-sizes the dragging will fail because the incorrect container_width value.
I suggest always taking the container's width and not a pre-cached value (that is not always correct).