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Behat
Ensure question/type/ddimageortext/tests/behat/preview.feature passes with --suite=boost
Manual test
Go to "Question bank"
Create a question (if you don't have one)
Observe preview and delete icon, they should not overlapped.
Go to a quiz, and add a question
Confirm that the edit icon (cog) for the question is visible, as well as the question icon