Reading where a cable lands meant going back to the drawing: the strip
editor said which cable a terminal carries and which core, but never
what the cable goes to. A single core (1x16) could not be followed
from the terminal to its piece at all.
The new Target column names it: Installation, Location and Label (BMK)
of the piece the wires land on, past this strip, joined in one line --
the very three fields the strip drawing writes in the box under its
cable, in the same order (RealTerminal::cableTarget()). It is worked
out of the project like the Cable cells and so follows their rule: a
target the drawing names is read only, for only the drawing decides
it, and a cell nothing is worked out for takes an edit, so a target
the drawing cannot find -- a cable landing on a piece with no
Installation, Location nor Label set, a cable going to another strip
-- is still worth naming by hand. The text typed in is stored in the
element (RealTerminal::cableTargetInfoKey()) and kept until a cable
works a target out again, and back once that cable goes, exactly like
a cable designation typed by hand: the automatic value is never
written, so no stale text can be left behind. The column takes the
width of its own text, so a long Installation is never cut off.
A text typed in is written the way the fields are shown in the column,
"Installation / Location / Label", and gives one line per field: the
box under the cable draws three lines without any slash in them, just
like a target worked out from the project, instead of one long line
carrying its separators as text.
tst_terminalcableauto checks the column is empty -- and editable --
without a cable, reads "Plant 7 / Cabinet 7 / -S7" with one, goes
empty -- and editable again -- when the core is removed, takes no edit
while the drawing names the target, and is headed "Target"; a second
case checks a target typed in by hand is taken by the cell, stored by
Apply, shown again by a fresh model, set aside for the read only
target of the drawing once a cable lands somewhere worth naming, and
back once that cable goes; a third one the line per field. tst_cable
target paints a strip whose cable ends on one field and the same strip
ending on three, the second box two lines deeper than the first.
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