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QListWidget: blank line appears during runtime and "selection shifts"

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Hi, I have QListWidget populated with custom items – each contains some labels. From time to time “blank item” suddenly appears on top of list, other items move one position down and selection “shifts one line” – when you click on first row it highlights, but selected is index you clicked + number of blank items. In fact it seems like items are “physically” in place, but their graphical representation shifts down. When you drag&drop any item to the blank space, all blank line disappear and everything is alright for a while. Thanks in advance for any suggestions!

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