Toggles the 'frame stack' window, which displays the stack of visible frames under the mouse pointer. (There are also key bindings for this).
切换“窗口堆栈”窗口， 该窗口指代当前鼠标指针下的可见窗口。（这个功能也有一些按键绑定）
Notice that the word 'Print' now is floating under your mouse pointer.
注意，现在单词“打印”将浮动在鼠标指针下方。
If the object under the mouse pointer is already selected, this property promotes the object to be the primary selection object.
如果已选定鼠标指针下的对象，则此属性会把对象提升为主选择对象。
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