traffic_sign=variable_message has two direction fields

[Dimitar5555]

Describe the bug
traffic_sign=variable_message has two direction fields (one for direction and one for traffic_sign:direction.

To Reproduce

1. Go to https://www.openstreetmap.org/edit#map=19/43.79918/25.91882
2. Select node/12089459546

Expected behavior
Only one field should show up. Possibly direction since it used on 1.8k elements with traffic_sign=variable_message (compared ~1k for traffic_sign:direction).

Screenshots
I've entered values for the fields, to show that two tags are applied.

[tordans]

Some research

The issue is that data/presets/traffic_sign/variable_message.json has two direction fields

1. the explicit field https://github.com/openstreetmap/id-tagging-schema/blob/main/data/fields/direction_vertex.json
2. the inherited/referenced field from https://github.com/openstreetmap/id-tagging-schema/blob/main/data/presets/traffic_sign.json which is https://github.com/openstreetmap/id-tagging-schema/blob/main/data/fields/traffic_sign/direction.json for vertex (https://github.com/openstreetmap/id-tagging-schema/blob/main/data/fields/direction_point.json for points)

The fields/direction_vertex is there from the start – History.
So is the fields/traffic_sign/direction – History

The fields/direction_vertex is used a lot – List
The fields/traffic_sign/direction is used only once – List

Proposed solution

Given that research, I think the way to solve this is to remove the fields/traffic_sign/direction field and reference fields/direction_vertex for presets/traffic_sign/variable_message.

I will add a label "good first issue" to this.

[raghav3615]

@Dimitar5555 @tordans open a new PR for this issue. kindly review it