Even if the parameter "View>Attachment>inline" is settled, the attachement picture is not shown in the message body. Reproducible: Always Actual Results: The pictures are not shown in the message body Expected Results: Pictures are shown directly in the message window.
Created attachment 97196 [details] Screenshot
It's fixed now in 5.2 I am not sure that I can backport it in 5.1
If you wanna backport it, you may also packport the tests to make sure, that it works: http://commits.kde.org/messagelib/dfb04c684fc03015660bd423c1c06a4f743d7e2a