Steps to reproduce:
- Edit a duplicate question and attempt to add the same question as a second duplicate.
I should see an error telling me I can't add a question as a duplicate twice.
I can't see the error alert/modal, it's hidden by the dupe picker.
Google Chrome Version 56.0.2924.87 (64-bit)
macOS Sierra 10.12.3 (16D32)
EDIT July 28th, 2017:
There seems to be regression on this bug. I just reproduced this again today.
Google Chrome Version 59.0.3071.115 (Official Build) (64-bit)
macOS Sierra 10.12.5 (16F73)