Keyboard shortcut for explicit leafref enumeration rather than data enumeration

[NetworkOverload]

In clixon, tab completion can be set to either enumerate existing data, or to follow leafrefs to enumerate valid reference objects for configuration data.

I am proposing to allow both modes of operation by adding a new keyboard shortcut such as shift+tab that can be configured to explicitly follow leafrefs for enumerating valid choices, while tab could be configured to enumerate configuration data.

Context: Clixon controller, configuration.xml

clixon/yang/clixon/clixon-config@2024-04-01.yang

Line 1007 in ca786da

leaf CLICON_CLI_EXPAND_LEAFREF {