Line-numbering when using lb-Tags

When using l-tags withing a lg-element, each l-tag gets a line number. Lines should be numbered in the same way when using lb-tags e.g. inside a p-element. This is however more complicated to implement since the first line starts before the first lb-tag and also a new p-tag should probably not reset the line-counting, maybe only(?) a pb should reset it but then we could have pages with two columns with separate line-numbering. So that feature is a bit more complicated …