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The methods slotRefreshItems(), slotItemsAdded() and slotItemsDeleted() are adapted so they are now compatible with the new behavior of filtering expanded folders achieved in ed83f37f. The new behavior is that expanded folders are hidden from view if neither the folder itself nor any of its contents passes the filter. Previously expanded folders would always stay visible no matter the filter. A bug where the parent expanded folder would disappear after adding or refreshing an item while filtering is also fixed. Tests are added to make sure these behavior changes won't regress. BUG: 442275 FIXED-IN: 22.04
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