bookmarksCountBookmarksInTrees

open override fun bookmarksCountBookmarksInTrees(folderGuids: List<Guid>): UInt

Counts the number of bookmarks in the bookmark tree under the specified GUID. Does not count the passed item, so an empty folder will return zero, as will a non-existing GUID or the guid of a non-folder item. Counts only bookmark items - ie, sub-folders and separators are not counted.