V10 Regression: Inverted group bus members lost from the bus

Description

When a bus label contains inverted members, these nets are not considered bus members. If the bus connects across sheets, the inverted bus members do not connect between sheets. This is a fatal regression from v9.

ERC no longer recognizes existing inverted bus member entries as members of the bus. Unfolding from the bus creates a non-inverted bus entry.

Steps to reproduce

  1. Using KiCad v9, create a group bus using a global label with both inverted members (such as ~{CAS}, ~{RAS}, ~{WE}) and non-inverted members (such as A[2..0]).
  2. Unfold these bus members. Note the inverted members are displayed with overbars.
  3. Create a second sheet and instantiate the same global group bus.
  4. Unfold these bus members on the second sheet.
  5. Highlight one of the non-inverted bus members. Note that it is highlighted on the other sheet.
  6. Highlight one of the inverted bus members. Note that it is highlighted on the other sheet.
  7. Save the KiCad project and close v9.
  8. Open the schematic with KiCad v10. Note that all bus members are properly displayed in the bus label.
  9. Run ERC. Note ERC reports these inverted members are "graphically connected" but not members of the bus.
  10. Highlight one of the non-inverted bus members. Note that it is highlighted on the other sheet.
  11. Highlight one of the inverted bus bus members. Note that it is not highlighted on the other sheet, indicating there is not a connection.
  12. Attempt to unfold an inverted member of this bus. Note that the created net is not inverted.

This bug is fatal to a design, as the connections of inverted bus members are lost across sheets. I'm guessing this means that updating such a PCB will result in the tracks for the inverted bus members being disconnected or destroyed, though I have not tested this.

KiCad Version 

Application: KiCad Schematic Editor x86_64 on x86_64

Version: 10.0.0-rc2-4d14471ef6~187~ubuntu24.04.1, release build

Libraries:
	wxWidgets 3.2.4 GLX
	FreeType 2.13.2
	HarfBuzz 8.3.0
	FontConfig 2.15.0

Platform: Ubuntu 24.04.3 LTS, 64 bit, Little endian, wxGTK, X11, x11, KDE, KDE
OpenGL: NVIDIA Corporation, NVIDIA GeForce GTX 1060 6GB/PCIe/SSE2, 4.6.0 NVIDIA 580.126.09, GLX 1.4

	wxWidgets: 3.2.4 (wchar_t,wx containers) GTK+ 3.24
	Boost: 1.83.0
	OCC: 7.6.3
	Curl: 8.5.0
	ngspice: 43
	Compiler: GCC 13.3.0 with C++ ABI 1018
	KICAD_IPC_API=ON
	KICAD_USE_PCH=OFF

Locale: 
	Lang: en_US
	Enc: UTF-8
	Num: 1,234.5
	Encoded кΩ丈: D0BACEA9E4B888 (sys), D0BACEA9E4B888 (utf8)
Edited by Reece Pollack