id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
17496	AutoFilter: infer sensible default values for layer	derickson.e@…	team	"I believe autofilters would be more useful if some tags were inferred when not actually present. For objects missing a `layer=*` tag, I propose the following scheme:

- `bridge=*`, `power=line`, `location=overhead`: assume `layer=1` if not specified
- `tunnel=yes`, `tunnel=culvert`, `location=underground`: assume `layer=-1` 
- `tunnel=building_passage`: assume `layer=0`
- Other `highway=*`, `waterway=*`, `railway=*`: assume `layer=0` 

A user who had autofilters enabled for the layer tag could then use autofilters as if those tags were present. For example, it is not recommended to tag layer=0, but such a filter would be useful when working on a complex motorway interchange, filtering out all objects not assumed to be at surface level. The autofilter buttons would still only appear when an object with a layer=* tag is in the viewport, as is currently, but whenever an autofilter button appears, there would also be a ""0"" button between the ""1"" and ""-1"" buttons.
"	enhancement	closed	normal	20.01	Core		fixed	autofilter