Turning the default "Chiffre 1" part into a "Cyclique (modulo)" one left
the modulus spin box at 0, and a modulus of 0 means "no cycle" -- so the
part counted upward forever instead of wrapping, which is the whole point
of the type. Reported on #593 against a modulus-7 test and, more usefully,
against a real April 5000 PLC layout addressed %IX0.0..%IX0.31 per card.
setType() defaulted the modulus to 8 inside the block that installs numeric
behaviour, and that block runs only when the *previous* type was
non-numeric. Switching from one numeric type to another skips it. Since a
fresh part starts out as "Chiffre 1", the ordinary way to reach this
feature -- change the type of the part in front of you -- was exactly the
path that skipped the default. Going the long way round, via "Texte", set
the modulus to 8 and worked, which is why the feature tests fine when you
build the context some other way.
Moved the default out of that block so it applies whatever the part was
before, and made it fire only when the current modulus is unusable, so a
value the user picked on purpose survives switching type away and back.
The wrap/carry arithmetic itself was already correct: with a carry target
in front of it, a modulus-32 part yields %IX0.0..%IX0.31, %IX1.0 as asked.
Saved configurations are untouched -- a stored modulus, including a 0 left
behind by this bug, still loads and round-trips exactly as it was.
ispyisail
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