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+# The Tagbottom message row against a pane with almost no body. That row is the
+# pane's LAST BODY row — the tagline's neighbour once Tagbottom has taken the
+# last row — so it only exists while the pane HAS a body row. Two rows is the
+# smallest pane that does. One row is a tagline and nothing else, and there the
+# message waits: not drawn over the tag, and not on the row above the pane,
+# which is what `r.y + r.h - 1 - BOX_H` gives you when the guard is off by one.
+file s.txt one\ntwo\nthree\nfour\nfive\nsix
+start 10 80 s.txt
+wait 8000 s.txt
+stable 700 20000
+key space t b
+stable 700 15000
+# `/` with room to spare: the prompt is cut off the tagline (grid 9) and drawn
+# on grid 8, the last body row, with the cursor.
+key /
+send ZZ
+stable 600 8000
+stable 400 5000
+snap roomy
+# two body rows left; the prompt takes the lower one and line 1 still shows
+resize 4 80
+stable 700 10000
+snap two-body
+# one body row, and the prompt takes it. The tagline underneath must still be
+# drawn in full — this is where an off-by-one eats it.
+resize 3 80
+stable 700 10000
+snap one-body
+# the tagline alone. No body row, so nothing of the prompt is drawn anywhere —
+# not over the tag, not on the row above the pane. The tagline itself is
+# untouched: the marker sits after the builtins, so cutting the tail there
+# leaves every column of it exactly as `tag-only` would look unarmed.
+resize 2 80
+stable 700 10000
+snap tag-only
+# ...and grown back, still armed, back on the last body row
+resize 10 80
+stable 700 10000
+snap regrown
+key esc
+settle 100
+stable 400 5000
+# the SPC leader indicator rides the same row, right-aligned, and shrinks onto
+# the single body row with it
+resize 3 80
+stable 700 10000
+key space
+stable 400 8000
+snap leader-one-body