Comment 10 for bug 1851403

I am ok with this as long as users are informed about this change on updating a schematic from v5 to v6. (So there should be a warning generated if the updating algorithm discovers a symbol with stacked NC pins.)

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Also NC pins can be connected to a wire right now. I read your commend as if this would no longer be the case in the future. If so then this would be another thing where a warning would need to be generated should it be discovered.

ERC does complain about it right now. There are legitimate parts where one can connect a pin that is documented as NC in the datasheet. The guidelines of the official lib (KLC) would not allow such a pin to be of type NC but users do not need to follow KLC for their personal lib. And of course there are symbols in the official lib where this was missed. One example https://github.com/KiCad/kicad-symbols/issues/2249 (A EMC protection device where half its pins are not connected internally but will in most cases be connected on the pcb)