Fixed regression with changing widths when stylenames have changed (#13444, #8801):

Changing the name of a style should not cause the width of the textbox
to change. If there is a width set for the wrapper, the width for the
wrapper should not change if the styles changes.

To reconcile these two demands, we have removed the width for the
wrapper and only manipulate the width of the textbox itself. This
solves both issues neatly.

Change-Id: Idb2dbc5d2ca6406cafb44df93110e079a1dff473