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vega display --live reads the kernel's input events with no library:
keys become Pure's key names and the text they type on a US layout, going
through the TUI's own handling (the input line takes text, else the app
takes keys); a mouse moves an outlined pointer and clicks, a touch screen
presses where it is touched, scaled from the device's range; the line
pressed is the row. --input FILE reads recorded events to their end and
prints the last frame, which is how this screenless Pi checks it: after
typing two items with Shift, Enter, Tab, Space and a touch on a row, the
display's last frame is the TUI's after the same keys and click, and came
back from the display controller as drawn.
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