Via Tool should get net of tracks.

[Strntydog]

When using the Via Tool, the Via defaults to "No Net", however this causes design violations in certain circumstances, for example, using the Via tool to place a via between tracks.

The Via placed with the Via Tool, should get its net from entities it is placed upon. For example:

1. Place Via on a Pad (No other entities overlap in the board stack): Via gets Net of the pad.
2. Place Via on a track (No other entities overlap in the board stack): Via gets Net of the Track.
3. Place Via over intersection of two (or more) tracks/pads with the same net (No other entities overlap in the board stack): Via gets Net of the intersecting tracks.

4. Place Via over entities which overlap, but do not ALL share the same Net, would cause a DRC violation and should not be allowed with DRC checks enabled.

5. Place Via on a fill (with no other fill or entity overlapping): Via gets Net of the fill.

6. Place Via on a area where multiple fills overlap: Via gets Net of the fill on the current selected Layer.

There may be more circumstances, but in each case, the Via tool should not cause a DRC error on the board (for example, by setting the Net to No Net but placing the via on a track with a Known Net.

Version:
Application: kicad
Version: no-vcs-found-e2505cb~60~ubuntu17.04.1, release build
Libraries:
    wxWidgets 3.0.2
    libcurl/7.52.1 OpenSSL/1.0.2g zlib/1.2.11 libidn2/0.16 libpsl/0.17.0 (+libidn2/0.16) librtmp/2.3
Platform: Linux 4.10.0-33-generic x86_64, 64 bit, Little endian, wxGTK
Build Info:
    wxWidgets: 3.0.2 (wchar_t,wx containers,compatible with 2.8) GTK+ 2.24
    Boost: 1.62.0
    Curl: 7.52.1
    Compiler: GCC 6.3.0 with C++ ABI 1010

Build settings:
    USE_WX_GRAPHICS_CONTEXT=OFF
    USE_WX_OVERLAY=OFF
    KICAD_SCRIPTING=ON
    KICAD_SCRIPTING_MODULES=ON
    KICAD_SCRIPTING_WXPYTHON=ON
    KICAD_SCRIPTING_ACTION_MENU=ON
    BUILD_GITHUB_PLUGIN=ON
    KICAD_USE_OCE=ON
    KICAD_SPICE=ON

[Jeff Young (jeyjey)]

This is very similar to https://bugs.launchpad.net/kicad/+bug/1548129.

[Strntydog (strntydog)]

I disagree.

https://bugs.launchpad.net/kicad/+bug/1548129 is about an old track which ends up "isolated" on the board which resulted in it being assigned no-net when connectivity is recalculated.

This bug is about a brand new via being placed on the board (using the Via Tool), being arbitrarily and always assigned the net no-net.

Placing a NEW via or placing a NEW track should have the same rules. When you place a New track, if you start it on an old track it gets the net of the old track, not no-net. New vias should be the same, not just always be assigned no-net, regardless of where they are placed.

[Jeff Young (jeyjey)]

In both cases the router should consider "no net" as "any net", and change it to the net of the connected item.

[Jeff Young (jeyjey)]

Vias placed on pads, tracks and zones now pick up their respective nets.

The DRC issues are being tracked in: https://bugs.launchpad.net/kicad/+bug/1718827.