inverted filter "child type:way" disables untagged nodes of ways

[Cobra]

1. download some arbitrary data
2. add filter "child type:way", invert it ([x][ ] child type:way [x] A)

expected result: all nodes which are part of a way are active, independent of any tags.

current result: only tagged nodes which are part of a way are active. This equals "child type:way -untagged", which doesn't change the current - broken - behaviour.

[bastiK]

Current idea to fix this:

• remember, whether the parent way has been hidden explicitly (i.e. a non-inverted filter applies)
• don't let the hidden flag propagate from way to child node, unless the way is hidden explicitly

[bastiK]

In 5423/josm:

doc + cosmetics (see #7948)

[bastiK]

In 5437/josm:

fixed #7948 - inverted filter "child type:way" disables untagged nodes of ways