Recipient container is not working as expected. Instead of having a 'limit' of max-height, we should take all the available space (Issue 5.1 attachment). Furthermore, adding 'overflow: scroll' is creating a wrong overflow-x in the recipients-container (check Issue 5.2 attachment). As well we should avoid 'pull down' effect when having only one recipient (check Issue 5.3 attachment). (see issue attachments in bug 837994)

I'm not sure where is problem in issue 5.1 and the meaning of the "available space". Does that mean recipient container's height should have dynamic height while pull down and reach the composer top for max height? Issue 5.3 seems fixed in the current master, please correct me if the issue need some specific reproduce step. For now I'll only add some css changes for issue 5.2 before figuring out the actual recipient panel behavior, thanks.

Hey Steve, You have RFIed me on this bug, but it is unclear what information you want me to provide. could you give more detail please..

Sorry that I didn't express the clear information at first. In https://bugzilla.mozilla.org/show_bug.cgi?id=837994#c35 , Borja said the recipient container is not working as expected. So what is the expected behavior in this image he attached: https://bug837994.bugzilla.mozilla.org/attachment.cgi?id=747137 ? Currently we have 2 different height for recipient container, one is single line and another for multi line, but I don't understand "all the available space" for recipient container. Have you defined this behavior for adding recipient?

Hi Borja, I set dup to this issue first because 870544 should fix the all the concern you mentioned before. Please reopen this one if you are not satisfied with the result, thanks.

clearing needinfo as 870544 is fixed