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MasterElement::isFull() decided whether a coil had room left with
connected_elements.size() >= max_slaves
which counts linked *elements*. A slave stands for as many contacts as
its "number" kind information declares, so a 4 pole contact consumed a
single contact from the coil's budget instead of four. 36 elements in
the standard collection declare a number between 2 and 4, so this is
reachable, not theoretical.
Add ContactUsage, a header-only tally holding the two rules that are
easy to get wrong:
- a slave counts once per contact it declares, not once per element
- a changeover is counted once, as sw, and never as one NO plus one
NC. CrossRefItem::NOElements() and NCElements() both return
changeovers, so a count built by adding those two lists together
reports one changeover as two contacts.
The upcoming per-type displays (the used count in the element's General
tab, and the per-type budget on the cross reference) need exactly this
count, so it lives in one place rather than being written out three
times, and isFull() now reads it too.
The header carries no graphics dependency, so the counting rules are
unit tested on their own in tests/qttest/tst_contactusage.cpp,
following the same pattern as diagramsortkeys.h.
Verified: all 9 unit tests pass, and both rules were mutation checked
(counting elements instead of contacts fails 2 tests, counting a
changeover as both NO and NC fails 3). The 23 example projects still
load and export without crash or hang, and qet-lint reports no
regressions against its baseline.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>