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放置在system_bar上的popup菜单如果self_layout使用menu布局，在打开后不能显示
system_bar在显示区域顶部，描述如下 ：
<system_bar h="48">
<digit_clock x="c" y="m" w="200" h="100%" style="time" format="YYYY-MM-DD hh:mm" />
<view x="right:50" y="m" w="200" h="100%" children_layout="default(r=1,c=0,s=2)">
<label w="100" name="user_name" text="admin" />
<button w="32" text="menu" on:click="open('menu_down_right')" />
</view>
</system_bar>
popup菜单menu_down_right.xml描述如下：
<popup anim_hint="popdown" style="dark" self_layout="menu(position=down,x=right,w=128,h=90)" close_when_click="true">
<button text="Basic" focusable="true" name="open:basic" />
<button text="Button" focusable="true" name="open:button" />
<button name="open:confirm" focusable="true" text="Confirm" />
<button text="Close" focusable="true" name="close" />
</popup>
点击menu按钮后菜单没有显示。
改变菜单的布局为如下后，才可以显示：
<popup x="right:12" y="49" w="128" h="90" anim_hint="popdown" close_when_click="true">
<button text="Basic" focusable="true" name="open:basic" />
<button text="Button" focusable="true" name="open:button" />
<button name="open:confirm" focusable="true" text="Confirm" />
<button text="Close" focusable="true" name="close" />
</popup>
