The Category Tree page allows the user to search a single collection because category trees are assigned on a per collection basis.
Category Tree 页面允许用户搜索某一个集合，因为类别树（category tree）是按照每个集合指定的。
When a new product subtype is added to a selected product subtype then the new product subtype should immediately show up in the Tree without page refresh.
当一个新的产品子类被增加到所选产品子类上后，无需刷新页面，新产品子类应该立刻显示在树上。
If the checksum has not changed, the unstable tree is searched for the candidate page.
如果校验和没有更改，则会搜索不稳定树以寻找候选页面。
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