Sets the alignment of the widget. The argument should be one of <code>SWT.LEFT</code>,
<code>SWT.CENTER</code> or <code>SWT.RIGHT</code>. The alignment applies for all lines.
</p><p>
Note that if <code>SWT.MULTI</code> is set, then <code>SWT.WRAP</code> must also be set
in order to stabilize the right edge before setting alignment.
</p>
@param alignment the new alignment
@exception SWTException <ul>
<li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
<li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
</ul>
Sets the alignment of the widget. The argument should be one of <code>SWT.LEFT</code>, <code>SWT.CENTER</code> or <code>SWT.RIGHT</code>. The alignment applies for all lines. </p><p> Note that if <code>SWT.MULTI</code> is set, then <code>SWT.WRAP</code> must also be set in order to stabilize the right edge before setting alignment. </p>
@param alignment the new alignment
@exception SWTException <ul> <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> </ul>
@see #setLineAlignment(int, int, int)
@since 3.2