fix(cdk:popper): display: none
reference is not treat as hidden
#1659
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What is the new behavior?
为了适应一些refernece是鼠标浮动上去才显示的场景,display: none以及display: contents且第一个元素为display: none的元素,如果祖先节点不存在隐藏的节点,则不应当被视为reference hidden使浮层被隐藏,
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