Outdated smoothness and tracktype after surface updates

[sjakobi]

When users solve surface tasks, other surface-related tags of the same object may become outdated.

For example, in https://www.openstreetmap.org/way/60840215/history, version 5 changed the surface from grass to asphalt. But the tags smoothness=very_horrible and tracktype=grade3 remain.

I wonder whether this app could be a bit smarter about these updates.

For example, if the surface is changed from some kind of unpaved surface to a paved surface type, I think the smoothness can be safely deleted.

The tracktype can be checked for consistency with the surface. For example, grade4 and grade5 are fully incompatible with paved surface types.

[sjakobi]

I wrote the text above before finding #2771 and #4063.

Not sure if I'm providing any new ideas here, so feel free to close.

In any case I'm excited for #4105! :)

[matkoniecz]

Removing smoothness if surface value changed makes sense, I think. Even without asking user to confirm.

[sjakobi]

Actually, I think that certain changes of the surface value don't necessarily imply that the actual road surface has changed. For example, when unpaved is changed to some specific unpaved surface type.

There's also the issue that compacted, fine_gravel, gravel and pebblestones can be very hard to distinguish, so changes between these values may not indicate an actual change on the ground.