Norman Feske cd29ca3c40 base: add List_model::apply_first
The new 'apply_first' method enables users of the list model to manually
traverse the list model via the 'Element::next' method instead of
iterating via 'for_each'. This is needed in situations where the
list-model elements are visited via recursion, not via a loop.

Issue #3094
2019-01-07 12:33:56 +01:00
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