Version: (using Devel) OS: Linux Installed from: Compiled sources KDE 4.2.85/Qt 4.5.1 as shipped by Mandriva cooker. KMail with default layout (folder tree, message list and message body). Double clicking on folder name removes current message text from message body pane without any obvious mean to display it again (going to some other folder and back shows message). I'm still trying to make friend with new notebook with touch pad so accidental double click happens relatively often.
can confirm with 4.3.1
*** Bug 188053 has been marked as a duplicate of this bug. ***
Fixed in 4.7