Causes the receiver to be resized to its preferred size.
For a composite, this involves computing the preferred size
from its layout, if there is one.
<p>
If the changed flag is <code>true</code>, it indicates that the receiver's
<em>contents</em> have changed, therefore any caches that a layout manager
containing the control may have been keeping need to be flushed. When the
control is resized, the changed flag will be <code>false</code>, so layout
manager caches can be retained.
</p>
@param changed whether or not the receiver's contents have changed
@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>
Causes the receiver to be resized to its preferred size. For a composite, this involves computing the preferred size from its layout, if there is one. <p> If the changed flag is <code>true</code>, it indicates that the receiver's <em>contents</em> have changed, therefore any caches that a layout manager containing the control may have been keeping need to be flushed. When the control is resized, the changed flag will be <code>false</code>, so layout manager caches can be retained. </p>
@param changed whether or not the receiver's contents have changed
@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 #computeSize(int, int, bool)