[3628] Restore support for expand all and reveal in the explorer

[sbegaudeau]

Bug: #3628
Signed-off-by: Stéphane Bégaudeau [email protected]

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[pcdavid]

Works fine for reasonably sized models/trees.
I get some issues when expanding very large trees, which can take a long time for the backend to compute, but there is an ongoing effort on performance improvement in parallel, so I guess we can merge this and work on scalability in a second step.