Possible performance problem in MapCSS based Tag checker

[GerdP]

What steps will reproduce the problem?

See #16976

What is the expected result?

No debug message

What happens instead?

Two messeages are printed.

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

It seems that these rules in addresses.mapcss are matched although there is no way in the dataset:

way[addr:interpolation=odd] > node[addr:housenumber][get(split(".", tag("addr:housenumber")/2), 1)=0] {
    throwWarning: tr("Even housenumber in odd address interpolation.");
}
way[addr:interpolation=even] > node[addr:housenumber][get(split(".", tag("addr:housenumber")/2), 1)=5] {
    throwWarning: tr("Odd housenumber in even address interpolation.");
}

It seems that the selector works in the wrong way?

Build-Date:2018-11-10 15:44:56
Revision:14419
Is-Local-Build:true

Identification: JOSM/1.5 (14419 SVN en) Windows 10 64-Bit
OS Build number: Windows 10 Home 1803 (17134)
Memory Usage: 563 MB / 3641 MB (230 MB allocated, but free)
Java version: 1.8.0_191-b12, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: \Display0 1920x1080
Maximum Screen Size: 1920x1080
VM arguments: [-agentlib:jdwp=transport=dt_socket,suspend=y,address=localhost:54845, -ea, -Dfile.encoding=UTF-8]
Program arguments: [--debug]

Plugins:
+ OpeningHoursEditor (34535)
+ apache-commons (34506)
+ buildings_tools (34572)
+ download_along (34503)
+ ejml (34389)
+ geotools (34513)
+ jaxb (34506)
+ jts (34524)
+ measurement (34529)
+ merge-overlap (34664)
+ o5m (34405)
+ opendata (34698)
+ pbf (34576)
+ poly (34546)
+ reverter (34552)
+ undelete (34568)
+ utilsplugin2 (34506)

Last errors/warnings:
- W: Update plugins - org.openstreetmap.josm.plugins.PluginHandler$UpdatePluginsMessagePanel[,0,0,0x0,invalid,layout=java.awt.GridBagLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=9,maximumSize=,minimumSize=,preferredSize=]
- W: No configuration settings found.  Using hardcoded default values for all pools.
- W: Failed to locate resource '/README'.
- W: Failed to locate resource '/CONTRIBUTION'.
- W: Failed to locate resource '/LICENSE'.