The implementation of this column was only a wrapper around what setColumnWidth/setPreferredWidth
would have done. Also, the mechanism how this method was used was really weird, effectively propagating
the (preferred) width from the ITableColumn implementation of the grid peer to the XGridColumn implementation
of the grid column model. This was done each time the (preferred) width was access for reading - not really
a clever solution.
Now, the ITableColumn knows its respective XGridColumn, and simply forwards the (preferred) width as needed.
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