Feature request #15150
Add explanation on "Avoid intersections" totally wiping out a feature geometry
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When one erases all the vertices of a feature, (s)he gets noticed that the feature is now a geometryless one.
Using the "Avoid intersections" option, one can end up with a geometryless feature and be really troubled by not seeing a geometry (it's easy to forget to uncheck that option). It might be good to also show a message explaining that the geometry has been wiped out due to "avoid intersection" and that the "add part" tool can help recreate one