1. (optionally) Set caret.period=0.
2. Open a small file (it's content should entirely fit on the screen).
3. Delete a line, or contract a fold, or switch from a buffer with a bigger file.
Some lines will not disappear from the screen until you type a key, or move mouse in or outside of editing pane, of until next caret blink (if caret.period is not 0).
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