osing state. When a
new widget is found (its key and type do not match a previous widget in
the same location), but there was a widget with that same global key
elsewhere in the tree in the previous frame, then that widget's element is
moved to the new location.</p>
<p>Generally, a widget that is the only child of another widget does not need
an explicit key.</p>
<p>See also:</p>
<ul>
<li>The discussions at <code>Key</code> and <code>GlobalKey</code>.</li>
</ul>
</section>

        
<section class="summary 