It runs a regex search as you type, folding out anything that isn't +/- $lines from the found regions, so as to only show relevant context (like grep). If you press enter to `commit` it'll delete any of those `red dot` marked (in the gutter) lines. In either case, pressing enter or escape closes the input panel and the initial view folding/selections are restored. You can see there's a Zebra striping pattern surrounding contexts indicating contiguous lines, without recourse to getting dirty in the gutter.
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