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+# Tagbottom: every pane's tagline on its LAST row instead of its first, and
+# the transient message row (prompts, messages, the SPC indicator) at the other
+# end with it. One global bool, so the whole screen flips at once.
+#
+# The two things worth pinning here are not pixels. The first is that a click
+# still lands where it looks like it lands: the Sel coordinate space is
+# UNCHANGED (row 0 is the tag, the body starts at BOX_H) and the mouse maps a
+# screen row into it, so a look or an execute on a bottom tagline acts on the
+# word under the pointer instead of silently sweeping whatever body row shares
+# that number. Every mouse assertion below is therefore a CONSEQUENCE — a pane
+# appearing, a pane going away, a view scrolling by a counted number of rows —
+# and not a picture of a highlight. The tagline-execute pair is what caught the
+# bug this script exists for: before the tag row got its own arm in the
+# execute/look press, both ran a blank body row and a golden recorded the
+# no-op as if it had passed.
+# The second is that turning it back off restores the top-tagline layout
+# exactly: `off` is byte-for-byte `boot`, cursor included.
+file top.txt aaa\nbbb\nccc\nddd\neee\nfff\nggg\nhhh\niii\njjj\nkkk\nlll\nmmm\nnnn\nooo\nppp\nqqq\nrrr\nsss\nttt\nuuu\nvvv\nwww\nxxx\nyyy\nzzz
+file bottom.txt ZZONE\nZZTWO
+start 30 100 top.txt
+wait 8000 New Newcol
+wait 8000 top.txt
+stable 700 20000
+snap boot
+# SPC t b. The tag leaves row 1 for row 29, the body slides up one row, and
+# the cursor goes with it (7,2 -> 7,1) because it is on the same file line.
+key space t b
+stable 700 15000
+snap on
+# ...and straight back. This grid must equal `boot`'s, to the cell.
+key space t b
+stable 700 15000
+snap off
+key space t b
+stable 700 15000
+# CLICK the bottom tagline (col 50 of row 30, the pane's last row) and type
+# into it. A clicked tag is insert mode, so the text lands as text, and the
+# cursor is down on the tagline with it. Col 50 is past the end of the path,
+# which is read-only — a click inside it parks the cursor there and the typing
+# goes nowhere.
+press left 50 30
+release left 50 30
+stable 400 5000
+send \x20bottom.txt
+stable 600 8000
+stable 400 5000
+snap tag-typed
+# ...and LOOK the word just typed, from that same bottom tagline: bottom.txt
+# opens as a second pane below. It only can if the press was mapped to the tag
+# — mapped as a body row it lands on blank line 29 and looks nothing at all.
+press right 55 30
+release right 55 30
+wait 10000 ZZONE
+stable 700 15000
+snap look-bottom-tag
+# a body click in the UPPER pane: the cursor lands on the row under the
+# pointer, counted from the pane's first row rather than from a tag that is no
+# longer there. Row 6 is grid row 5, the fifth body row, file line 5.
+press left 10 6
+release left 10 6
+stable 400 8000
+snap body-cursor
+# The h-resize seam. With top taglines it is the upper pane's LAST row; here
+# that row is the upper pane's TAG, so the handle is the lower pane's FIRST row
+# (grid 16, click row 17). A no-drag click on it must leave both sizes alone.
+press left 40 17
+release left 40 17
+motion 40 25
+stable 500 8000
+snap seam-noop
+# ...and the real drag, five rows up: the upper pane keeps 10 rows, the lower
+# grows to 19. Both taglines follow their own pane's bottom.
+press left 40 17
+drag left 40 12
+release left 40 12
+motion 40 25
+stable 500 8000
+snap seam-dragged
+# the wheel over the BODY of the upper pane (nine body rows now): four rows
+# down, so the view starts at line 5 and the pinned cursor rides up to the
+# pane's first row
+wheel down 40 4
+wheel down 40 4
+wheel down 40 4
+wheel down 40 4
+stable 400 8000
+snap wheel-body
+# ...and one row back up with the wheel over the GUTTER: the same pane, found
+# through its gutter column. View at line 4.
+wheel up 1 4
+stable 400 8000
+snap wheel-gutter
+# a left click in the gutter scrolls UP to the clicked row, and the row it
+# counts from is the BODY's first, not r.y + BOX_H. Row 4 is grid row 3, the
+# third body row: two rows up, to line 2. Counted from the wrong end it would
+# be one row up, to line 3.
+press left 1 4
+release left 1 4
+stable 400 8000
+snap gutter-click
+# `/` in the lower pane's body arms the search input. The prompt is CUT off the
+# tagline and drawn on the message row with the cursor — and with Tagbottom
+# those two are at opposite ends of the pane: the tail keeps its builtins on
+# row 29 while `/ZZ` and the cursor sit up on row 11, the lower pane's first.
+press left 10 14
+release left 10 14
+stable 400 5000
+key /
+send ZZ
+stable 600 8000
+stable 400 5000
+snap search-prompt
+key esc
+settle 100
+stable 400 5000
+# the SPC leader indicator lives on that same message row, right-aligned
+key space
+stable 400 5000
+snap leader
+key esc
+settle 100
+stable 400 5000
+# THE INVERSION. Sweeping DOWN past the last body row is the ordinary "select
+# to the end" gesture, and with the tag drawn BELOW the body it lands on the
+# tagline — Sel row 0. Unclamped that drives the selection's far end to the TOP
+# of Sel space: the highlight jumps ABOVE the anchor and a 1-2 Cut deletes lines
+# nobody swept. Anchored on grid row 3 (file line 4) and dragged onto the upper
+# pane's tag row, the sweep must cover lines 4..10 downward, not 2..4 upward.
+press left 8 4
+drag left 8 11
+stable 400 5000
+snapstyle sweep-down
+# ...and the proof is the BUFFER, not the highlight: 1-2 Cut the sweep, save,
+# and read the file back. aaa/bbb/ccc survive and kkk..zzz survive; unclamped
+# this file lost bbb/ccc/ddd instead and kept eee onward.
+press middle 8 11
+release middle 8 11
+release left 8 11
+stable 400 5000
+snap cut-down
+key space f s
+stable 700 15000
+snapfile cut-buffer /tmp/pardes-snap/tagbottom/cwd/top.txt
+# EXECUTE `Del` on the lower pane's bottom tagline: the pane goes away and the
+# upper one takes the whole column back. The middle button's half of the same
+# tag mapping the look used above.
+press middle 78 30
+release middle 78 30
+stable 700 15000
+snap del-bottom-tag
+# and off again, one pane, its tagline back on row 1 with the body under it
+key space t b
+stable 700 15000
+snap off-again