Displaying all sub-clones does not work

Reported by @espyr and Patrice.

The + button (near the search box) should display at once all subclones. It is not fully working (+ are changed into -, no display of subclones).

See for example http://app.vidjil.org/?set=3241&config=32

Edited Jul 11, 2019 by Mathieu Giraud

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