Automatic filters on numeric tag values

[Don-vip]

During last SOTM-FR there were several interesting talks about indoor mapping and the applications around it.

It was clear indoor mapping with JOSM has room for improvement. Although there's ​indoorhelper plugin, indoor mappers usually have to define a lot of filters and the task is not easy.

Looking at the existing applications such as ​openLevelUp! I had an idea about an automatic way to use filters, as follows:

The feature is generic and preconfigured for the following numeric tags:

• level (by default)
• layer
• maxspeed
• voltage

This is extensible by plugins, the tags are only analyzed at high zoom levels to reduce the performance penalty, and the color is customizable.

Only one tag at a time, which can be chosen in preferences:

It seems to behave well on the areas I tested (mainly Paris), all feedback welcome :)