Dropzone blocks interactions

[Chelnoque]

After clicking on dropzone, it blocks all interactions with its content - clicks don't pass, dropping something behaves as if there's nothing under the cursor. True for both verb and element dropzones.

[alexiskennedy]

This was an issue after drag-and-drop of the zone. IIRC, I eventually fixed it by manually setting the sibling order. Probably it needs the sibling order code to run after a click too.