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+# MULTIPLE CURSORS on a real file pane. The differential suite (hxdiff) proves
+# the model against a real helix but is headless, so this is the part it cannot
+# see: that every range is actually on screen, that the primary reads
+# differently from the others, and that ONE keystroke edits at all of them.
+lines f.txt 12
+start 30 150 -n 3
+wait 8000 f.txt
+stable 700 20000
+# open f.txt in the left pane (type its name, right-click to Look)
+press left 5 8
+release left 5 8
+stable 400 5000
+key i
+text f.txt
+key esc
+settle 100
+press right 6 8
+release right 6 8
+wait 10000 line 3
+stable 700 15000
+# top of the file, then C C: three cursors, one per line, primary on line 3
+key g g
+stable 400 5000
+key C C
+stable 400 5000
+snap three-cursors
+# the colours ARE the feature here: the primary's cell against the two dimmer
+# ones, each with its own bright cursor cell
+snapstyle three-cursors
+# one keystroke, three edits
+key i
+text >>
+key esc
+settle 100
+stable 400 5000
+snap edited-at-three
+# a selection per cursor: e selects to the end of the first word at each
+key g h w
+stable 400 5000
+snap three-selections
+snapstyle three-selections
+# `,` drops back to the primary alone; the two dim highlights must vanish
+key ,
+stable 400 5000
+snap keep-primary
+snapstyle keep-primary