EnhancedGrid cookie plugin sets column width to 0 or negative values when setColumnVisibility is used

[sudhas]

The test case is a modified version of test_enhanced_grid_cookie.html in dojo1.6.1. Add the following checkbox to the test page:

<input type="checkbox" onclick="(dijit.byId('grid')).layout.setColumnVisibility(1, !this.checked)" /> Hide column with idx = 1<br />

To reproduce the issue, hide the first column and reload the page. Un-checking the hide column checkbox would not show the first column, but when the space in between the 0th and 2nd columns is examined, it would contain the 1st column but with a width of -12px on firefox or 0px on chrome.

[Evan]

In [26732]:

Fixes #13972 by considering the hidden columns

[Evan]

In [27288]:

Refs #13972 adding a sane check