Remapping keys in configuration have no effect

[singularita@…]

I have tried to remap keys cor copy from default Ctrl-C to Ctrl-Insert and for Paste from default Ctrl-V to Shift-Insert.

However, when I pressed OK, closed JOSM and started it again, the key went back to default

I peeked in the preferences file, but the part related to shortcuts is not very human readable for configuration by hand, so I am not sure what is happening there.

I tried even removing all keys beginning with "shortcut." in case the problem is with the configuration going into some "rotten" state, but that won't help at all - the problem keeps happening.

The relevant section of configuration file (with which the problem is happening) is following:

shortcut.groups.0=-1
shortcut.groups.1=128
shortcut.groups.10=64
shortcut.groups.11=576
shortcut.groups.12=64
shortcut.groups.13=512
shortcut.groups.14=-1
shortcut.groups.15=640
shortcut.groups.16=640
shortcut.groups.17=576
shortcut.groups.18=512
shortcut.groups.19=128
shortcut.groups.2=128
shortcut.groups.20=512
shortcut.groups.3=0
shortcut.groups.4=512
shortcut.groups.5=0
shortcut.groups.6=512
shortcut.groups.7=-1
shortcut.groups.8=192
shortcut.groups.9=192
shortcut.groups.configured=true
shortcut.shortcut.1=system:paste;Edit: Paste;86;1000;155;64;false;true
shortcut.shortcut.3=file:upload;File: Upload to OSM ...;85;8;85;192;false;true
shortcut.shortcut.4=system:pastestyle;Edit: Paste Tags;86;2;86;192;false;true
shortcut.shortcut.5=view:gpxlines;View: Toggle GPX Lines;88;2;88;192;false;true
shortcut.shortcut.6=Open OpenStreetBugs;Open OpenStreetBugs;79;2;79;192;false;true
shortcut.shortcut.7=auto:Simplify Way;Simplify Way;89;2;89;192;false;true

[anonymous]

keys with "system:" ids are bindings to the operating systems global shortcuts, and as such cannot be changed. (unless the used os does not have bindings for that action, in that case they can be changed, e.g. Preferences on Windows)