id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
17768	Use code in MultipolygonTest to improve CreateMultipolygonAction	GerdP	GerdP	"A few things which are not good:
- Performance is poor when you update a complex multipolygon (MP) since `MultipolygonBuilder` uses complex area intersections 
- In special cases a created or updated MP might be flagged as incorrect by validator (`MultipolygonTest`)

My idea: The calculations in `MultipolygonTest` are using a faster implementaion to detect the inner and outer ways (as well as geometry errors), it only requires a few lines of code to implement a method `makeFromWays(Collection<Way> ways)` similar to that in `MultipolygonBuilder` and all the validation result (list of `TestError`s) comes for free.
In a further step I plan to use this to improve `Selector.CrossingFinder`."	enhancement	closed	normal	19.06	Core		fixed