When laying a track with [Track: Use Net Class Width] set,
opening up the track properties shows that the [Use net class widths] is disabled.
Setting [Use net class widths] and clicking okay is a one-time setting.
Is it possible to set tracks to autoupdate on the next Fill if the class track width changes,
without needing to go to Edit: Edit Track and Via Properties and update everything in the class,
whcih I believe overwrites any existing custom/non-conforming spacings as well.