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In bug434698 when we have a multiple selection it only detect one, for this bug it is intended to be possible to select more than one element.
We can see in CustomSiriusActionBarContributor we have: if (selection instanceof IStructuredSelection && ((IStructuredSelection) selection).size() == 1) When we run in debug mode for exemple in BorderRefactoringAction with brakepoing on "if (selection.size() == 1) {" if we have more than one selection it don't detect.
Proposed fix: https://git.eclipse.org/r/#/c/27926/
The bug is not fixed, a first proposal draft have been proposed on Gerrit for review.