Combine way: Instead of denying, offer help working outside downloaded area

[skyper]

What steps will reproduce the problem?

1. Download a route relation without members
2. Download members through relation panel's context menu entry "Download members"
3. Select two ways with one end node in common
4. Download parents
5. Combine way

What is the expected result?

As all needed data is available, no warning about outside downloaded area and the usual procedure when combining ways with its dialogs about conflicting tags and relation memberships.

What happens instead?

The action is denied without any help to download missing data nor any option to continue without downloading.

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

It would be sufficient to simply download the parents in prior, so why not offer this option?
At least in expert mode, there should be an option to continue without downloading as JOSM is not smart enough to detect that all possible information is available.

BTW: Why is this action call "Combine way" without a plural, e.g. ways.

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2020-06-15 21:37:22 +0200 (Mon, 15 Jun 2020)
Revision:16649
Build-Date:2020-06-16 01:30:48
URL:https://josm.openstreetmap.de/svn/trunk