This changes several aspects of bundling, bringing it somewhat more in line with KiCad library standards, and adding NC stacking (which is very useful with some footprints that can have 10s to 100s of NCs, believe it or not):
Hides the pin number entirely, since showing one random pin number for a stack of pins doesn't make a lot of sense (imho).
Hides the stacked pins rather than just hiding the pin number. This reduces the amount of rendering, although it probably doesn't make much of a difference. Regardless, this is what the library standards requests.
Makes the now-invisible stacked power pins of type "passive". Invisible power input pins become global nets, which we don't want.
Allows power output pins to be stacked. Same rules apply, and the stacked invisible pins are of type passive to avoid ERCs with multiple power outputs on a single net.
Allows stacking of NC pins. Invisible pins are still of type NC, but are shifted slightly off-grid towards the inside of the body of the part, in order to avoid shorts with each other as well as stray wires. The pins are shifted off-grid in different directions depending on the side of the body, so even with a lot of NCs, they won't run into each other from opposite sides.
This changes several aspects of bundling, bringing it somewhat more in line with KiCad library standards, and adding NC stacking (which is very useful with some footprints that can have 10s to 100s of NCs, believe it or not):