Bugs found but not fixed yet:
* Reference and Value are not converted correctly yet
* HOTFIX: test commented out
* GP3906-TLP and UBLOX_ZOE_M8-0-10 are not able to import the description again
* HOTFIX: description removed from gold file
The basic problem is that the DRC engine does length testing and skew
testing by collecting all the diff pair constituent parts and pairing them
itself. Since each part is collected on its own, we need to ignore the
'B' unit when evaluating any conditional expressions. However, doing this
in general means that when evaluating "OwnClearance()" we also ignore the
'B' unit and return the diff pair CLEARANCE_CONSTRAINT when we shouldn't.
This implements a more discerning test which know what the current requested
constraint is when evaluating expressions.
See also https://forum.kicad.info/t/solved-custom-differencing-rule-not-working-drc/34034/6
Fixes https://gitlab.com/kicad/code/kicad/issues/11314
Thomas Pointhuber
Jeff Young
Sylwester Kocjan