I find the solution for the test failures. But I am not able to reproduce the issue with "more" button. I tried with the 80 odd email addresses. Also in test-message-header mozmill tests, we have few test cases with 100 odd email addresses and it is working fine there also. I will attach the screenshot here. We have a mozmill test to check the behavior of the "more" button and it is passing. Can you check after moving that particular email? and this problem is only for that particular mail or all the other mails?
Bug 1537729 Comment 20 Edit History
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I find the solution for the test failures. But I am not able to reproduce the issue with "more" button. I tried with the 80 odd email addresses. Also in test-message-header mozmill tests, we have few test cases with 100 odd email addresses and it is working fine there also. I will attach the screenshot here. We have a mozmill test to check the behavior of the "more" button and it is passing. Can you check after moving that particular email to another folder or something? and this problem is only for that particular mail or all the other mails?