AJAX commands execute before Initial page response

Steps to Reproduce

<zk>
	<window id="outer"
			onCreate='Clients.showBusy(outer, "Outer Busy");'
			onClientInfo="Clients.clearBusy(outer)" width="500px" height="500px">
		Content
	</window>
</zk>

Current Result

busy message remains on screen

Expected Result

busy message gets cleared

Debug Info

clearBusy gets called before showBusy if the onClientInfo event responds very quickly (e.g. after 10ms on localhost)

Root Cause

there is a 25ms interval delaying the commands of the initial page response

https://github.com/zkoss/zk/blob/849c3d175aa13fef38a9ccf77b93dc60545e30c5/zk/src/archive/web/js/zk/mount.js#L83-L102

Workaround

call showBusy earlier during widget creation

	<window id="outer"
			w:onBind="zAu.cmd0.showBusy(this, 'Outer Busy')"
			onClientInfo="Clients.clearBusy(outer)" width="500px" height="500px">
		Content
	</window>