[Patch] Warn when you try to delete a node which is part of a way which is hidden by a filter

[Klumbumbus]

What steps will reproduce the problem?

Delete a node which is part of a way which is hidden by a filter

What is the expected result?

A warning appears

What happens instead?

The node is deleted from the hidden way, thus the way is modified

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

We already have a warning if you move the node. Deleting usually has even more impact.
from ​https://forum.openstreetmap.org/viewtopic.php?pid=784079#p784079

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2020-04-21 08:13:51 +0200 (Tue, 21 Apr 2020)
Build-Date:2020-04-22 01:30:47
Revision:16372
Relative:URL: ^/trunk

Identification: JOSM/1.5 (16372 de) Windows 10 64-Bit
OS Build number: Windows 10 Pro 1909 (18363)
Memory Usage: 857 MB / 1820 MB (273 MB allocated, but free)
Java version: 1.8.0_251-b08, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: \Display0 1680x1050
Maximum Screen Size: 1680x1050
VM arguments: [-Djava.security.manager, -Djava.security.policy=file:<java.home>\lib\security\javaws.policy, -DtrustProxy=true, -Djnlpx.home=<java.home>\bin, -Djnlpx.origFilenameArg=C:\Program Files (x86)\josm-latest.jnlp, -Djnlpx.remove=false, -Djava.util.Arrays.useLegacyMergeSort=true, -Djnlpx.heapsize=NULL,2048m, -Djnlpx.splashport=54189, -Djnlpx.jvm=<java.home>\bin\javaw.exe]
Dataset consistency test: No problems found

[GerdP]

In 16558/josm:

fix #19138: Warn when you try to delete a node which is part of a way which is hidden by a filter

• add check and dialog similar to that which is done when a node is moved

[Klumbumbus]

Ticket #12736 has been marked as a duplicate of this ticket.