netclass_assignments not copied, results in clearance violations

[markh-de]

Prerequisites

• [x] I have read FAQ
• [x] I have searched existing issues (including closed ones)
• [x] I use KiKit at least version 1.7.2 (older version are not supported)

KiKit version

1.7.2

KiCAD version (only KiCAD 8 and 9 are supported)

9.0.1

Operating system

Ubuntu Linux 24.04.2 LTS

Description

When panelizing, the project's netclass_assignments are not copied to the panel project file.

As a result, the created panel has clearance errors (this just bit me, including order cancellation at the fab, ouch).

Note that I'm not talking about netclass_patterns, but the direct net name -> net class assignments that are created when you use directive labels or rule areas, like this:

... which results in entries like these:

    "netclass_assignments": {
      "/MIPI_0_N": [
        "DP_100R"
      ],
      "/MIPI_0_P": [
        "DP_100R"
      ],
      "/MIPI_1_N": [
        "DP_100R"
      ],
      "/MIPI_1_P": [
        "DP_100R"
      ],
      "/MIPI_CLK_N": [
        "DP_100R"
      ],
      "/MIPI_CLK_P": [
        "DP_100R"
      ]
    },

Is support for such assignments (still) implemented in KiKit, or was it replaced by netclass patterns? Because we need both of them.

Thanks for KiKit!

Steps to Reproduce

• Have a design with directive labels directly on wires or on rule areas (they internally create netclass_assignments)
• Create a panel of such a design
• netclass_assignments are missing in the created panel project file

[yaqwsx]

This is a new feature in KiCAD 9, which I wasn't aware about (and it is implemented differently from standard net classes).