button stealing focus

Steps to Reproduce

focus-label-autodisable-1.zul

click "with autodisable"

after ZK-4866, try this case: https://zkfiddle.org/sample/1vi7oet/1-focus-with-autodisable

Current Result

the button changes it's label -> OK
the label gets focused -> OK
(sometimes - style is flickering for a fraction of a second)
the button receives the focus after a short time "stealing" the focus from the label

Expected Result

the label remains focused

when pressing the second button "no autodisable' or 'no label change'

Debug Information

this happens when the button has both autodisable enabled and a changing label at the same time

Workaround

when focusing native dom elements directly zk.currentFocus needs to be cleared.
(not necessary when using client side Widget.focus(), or server side focusing)

<button label="with autodisable" autodisable="self" xmlns:w="client">
 <attribute name="onClick"><![CDATA[
 self.setLabel("updated label" + new Date());
 ]]></attribute>
 <attribute w:name="onClick"><![CDATA[
 // shall clear zk.currentFocus to prevent focus restore to the auto disabled button
 zk.currentFocus = null;
 zk.$('$title').$n().focus();
 ]]></attribute>
</button>