in idea-plugin/src/main/java/com/jetbrains/ide/streamdeck/keymap/KeymapSchemeManager.java [42:52]
Keymap getMutableKeymap(Keymap keymap) {
KeymapScheme scheme = find(keymap);
if (scheme == null) return null;
if (scheme.isMutable()) return scheme.getMutable();
String name = KeyMapBundle.message("new.keymap.name", keymap.getPresentableName());
for (int i = 1; containsScheme(name, false); i++) {
name = KeyMapBundle.message("new.indexed.keymap.name", keymap.getPresentableName(), i);
}
return copyScheme(scheme, name).getMutable();
}