Warn about short ways

[skyper]

See my comment 4 and follow-ups on #20057 for the origin.

What steps will reproduce the problem?

1. Have a highway=motorway with total way length of less than one meter
2. Run validator

What is the expected result?

A (info) warning about a uncommen short way

What happens instead?

No warning

Please provide any additional information below. Attach a screenshot if possible.

MapCSS java eval expression waylength() can be used.
Can JOSM_pref(key, default) be used to set a minimum allowed length and maybe even tags to check on or tags to ignore?
I think of at least two levels as user might want to set a tiny default (0.01 meter) to not get warnings about highway=steps or waterway=stream but still handle major highways and other waterways with length below one meter.

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2020-11-17 02:38:27 +0100 (Tue, 17 Nov 2020)
Revision:17322
Build-Date:2020-11-17 02:31:05
URL:https://josm.openstreetmap.de/svn/trunk

[GerdP]

Can JOSM_pref(key, default) be used to set a minimum allowed length and maybe even tags to check on or tags to ignore?

I don't know this feature. Did you try it with validator rules?

[skyper]

No, sorry, did not find time coding.

All these bug hunts and reproducing plus the wiki updates took time. Just found more major problems with update and conflicts, yesterday, I have to find time to report (tomorrow). Considering the wiki Help/Concepts/Object and missing core actions are my primary goals, before I talk a look at #19504.

[Famlam]

Did you try it with validator rules?

If it helps:

way[highway][waylength()<0.33] {
  throwWarning: tr("Microroad");
}