History: Keep only unique entries

[ManDay]

Describe your suggested feature

Recalling an entry from history will also add it back to the history again. I think in most cases, that's not needed and only clutters history with duplicates. If the implementation is not to tedious, it would be nice if this were prevented. Recalled translations could be moved to the top of the history stack, instead.

Other details

For simplicity, maybe this uniqueness could be limited to recalled entries from history, rather than checked (by iterating through history and comparing each entry) for every entry.

Acknowledgements

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