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Only the app's key handlers could move a list's focus. When the focus
view is a plain index position (`view tasks_list_focus = at.position`),
Vega now asks Pure for that index and moves it as a user pointing at a
row (pure_app_point), with no code in the app. The grid remembers which
item each line shows; in the TUI a click on a row focuses it and the
wheel moves the focus one row (SGR mouse reports, turned off on exit).
Scripts say point VIEW ROW or click LINE COLUMN on the last shown frame.
The focus is stored like any event, so the next run of any surface
starts from it.
The model now points too: random scripts with points (some past the
end) and TUI clicks still match it on every surface, a mouse click on a
real pseudo-terminal moves the focus, and the stored session keeps it.
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The TUI rebuilt its grid from the app on every change and then sent all
of it. It now keeps what the terminal shows and sends each run of changed
cells after a cursor move (short unchanged gaps stay in a run, being
cheaper than another move; a run that starts in the second half of a wide
character starts at its first). A resize sends everything again.
vega tui --paint WxH writes the bytes of each frame; the checks replay
them with a small terminal emulator and compare with the dumped frame:
4,800 random frames at three sizes agree, and a change costs 139 bytes on
average against 1,220 for a whole frame. The interactive check now reads
the final screen from the replayed bytes.
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Vega reads a verified Pure module by convention: a table view with a
label column is a list (with optional badge, detail and tone), any other
table is a table, <table>_focus is its focused row, a title view is the
title and other views are fields. lib/vega.aup gives aup apps the tones,
which say what a row means; each surface decides how it looks or sounds.
vega tui draws the screen in a terminal, keeps the focused row in view
and evaluates only the cells on screen; vega cli prints plain lines for
pipes; vega say speaks the screen and each focus change as sentences.
Display width handles Hangul, CJK, emoji, combining marks and controls.
tests/check.py compares the CLI and NUI output with a reference model of
examples/todo.aup line for line, checks 9,600 TUI frames for scrolling,
focus, badge alignment and the number of cells evaluated, drives the
interactive TUI on a pseudo-terminal, and runs every aup example on every
surface.
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