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Collapsible section breaks editor icons #3530
I reproduce this with Orbeon Forms 2017.2 and 2017.2.1, but not with the latest master.
There is also the question of whether a section marked as non-collapsible in the builder should appear as such in the builder. For example Form Builder closes sections for large forms, and if those are not collapsible, the user won't be able to open them again.